NIU ELE 100 Online & In- Class Quizzes 1-6

अब Quizwiz के साथ अपने होमवर्क और परीक्षाओं को एस करें!

What tolerance does a silver band represent?

10%

A resistor's first three color bands are: brown, black, and black. What is its value?

10Ω

If 5V and 16V power supplies are connected in series-opposing, what is the total voltage?

11V

If the first resistor opened in the circuit of the previous problem, what would the total current be?

128mA

How do you calculate the voltage drop across each resistor in series in a circuit?

Find the total resistance, use it to calculate the current, and then use those values to find the voltage drop for each resistor.

How do you calculate the primary voltage applied to a transformer?

Find the voltage for the side of the coil ratio where current and resistance are given, and then use the coil ratio to find the voltage of the other side

MOSFET stands for

Metal Oxide Semiconductor Field Effect Transistor

Who discovered the principle of electromagnetic generators?

Michael Faraday

Which law is described by the following equation: V or E = I x R?

Ohm's Law

The formula for power is

P=IxE

The unit for capacitance is

farads

If a continuity tester does not light up, it means that the fuse is

broken

T/F: Voltage sources cannot be added in series if they have equal values and the same polarities.

false

T/F: Wet conditions decrease the risk of electric shock by lowering the skin resistance.

false

T/F: When you break a magnet in two, you can separate the two poles.

false

The machine that generates electricity from magnetism is called a

generator

A five-band color coded resistor has a value equal to 82.5 kΩ. What are the colors of the first four bands/

gray, red, green, red

A 56 KΩ resistor would have which colors on it's first 3 bands?

green, blue, orange

Identify the non-renewable energy resource.

nuclear

Electrical generators perform which kind of energy conversion?

mechanical energy to electrical energy

materials that allow electricity to flow through them easily are called

metals

A parallel circuit differs from a series circuit in that a parallel circuit has

more than one path for current flow

The machine that converts electrical energy to mechanical energy is called a

motor

Direction of electron flow in a circuit is always from

negative to positive

How will an open resistor affect a series circuit?

no current will flow in the circuit

Chain reaction can be seen in

nuclear power plant

Atomic mass is defined as the mass of a/an ___________ of an atom.

nucleus

Which of these colors is NOT used in the resistor value color code?

turquoise

How can you show that electricity creates a magnetic field?

use a compass near a wire with current flowing through it

A rheostat is another name for a

variable resistor

A voltmeter is used to measure the

voltage

A series network of resistors used to provide different voltages from a single source of energy is called a

voltage divider

The unit of voltage is

volts

The unit of power is

watts

Tools used to remove insulation from wires are:

wire strippers and knives

A 47 KΩ resistor woud have which colors on its first 3 bands?

yellow, violet, orange

Superconductors are materials that exhibit ___________ resistance to the flow of electricity.

zero

T/F: A group of batteries make up a cell.

false

T/F: A light emitting diode absorbs light to generate electricity.

false

T/F: A primary cell can be recharged.

false

T/F: A thermocouple consists of two similar metals bonded together.

false

T/F: Ammeters are always connected in parallel in a circuit for measuring the currents.

false

T/F: An electromagnet is a permanent magnet.

false

T/F: Atomic number is defined as the number of neutrons in an atom.

false

T/F: Current does not flow in a forward biased diode.

false

T/F: Diodes conduct in both directions.

false

T/F: Dry cells are normally used in cars and trucks.

false

T/F: If two wires have the same cross-sectional area and are made from the same material, the longer wire will have the lesser resistance.

false

T/F: Insulators offer very little resistance to the flow of electricity.

false

T/F: Integrated circuits are devices made up of only resistors.

false

T/F: Like charges attract each other.

false

T/F: Resistors connected in series do not share the same current.

false

T/F: Solid wire is more flexible than stranded wire.

false

T/F: Step-up transformers are located near to end user.

false

T/F: The fourth stripe in the five band color coded resistors indicates the tolerance.

false

T/F: The heavier the doping in a semiconductor, the lower the conductivity.

false

T/F: The magnetic field strength is the weakest at the poles and strongest along the length of the magnet.

false

T/F: The total resistance in a parallel circuit is always greater than the lowest-value branch resistor.

false

T/F: Two particles with different charges will repel or drive away from each other.

false

Which wire type is best suited for use as a lamp cord?

stranded

How do you calculate the total voltage when the power supplies are connected in series-opposing?

subtract

The three factors that affect capacitance are:

surface area, distance between the plates, and the insulating material

What is the device that is used to open and close a circuit?

switch

Devices used to open and close circuits without the inconvenience of disconnecting and reconnecting wires are called

switches

A transistor is used for

switching voltages and currents, amplifying small signals into large currents

Thermocouple is used to measure the

temperature

The areas of a battery that are marked positive (+) and negative (-) are called

terminals

When the plate area of a capacitor increases;

the capacitance increases

An object is not magnetized if

the groupings of atoms are scattered

What is meant by a step-down transformer?

the output voltage is smaller than the input voltage

Electromagnetic induction is a term used to describe

the production of electric potential due to change in magnetic flux

If the circuit is in parallel, the voltage is ___________ for each branch.

the same

If the circuit is in series, the current is ___________ across all resistors.

the same

The voltage across any branch of a parallel circuit is

the same as the other parallel elements

If replacement capacitors are not available, you should substitute it with a capacitor that has

the same rating, but higher working voltage

The total current in a parallel circuit is equal to

the sum of the current of each branch

The total capacitance of capacitors connected in parallel is

the sum of the individual capacitors.

Which size wire is larger in diameter: #10 or #24?

#10

Express 2.01 x 10^-4 in its normal number notation.

0.000201

Convert 300 µAmperes to Amperes.

0.0003 Amperes

If you were to place a 3000 Ω resistor across a 9 volt battery, what would be the power dissipated from this resistor?

0.027W or 27mW

A voltage of 9V is placed across a 27Ω resistor. What is the value of the current flowing through it?

0.33 Amps

How much current flows in a circuit with a 1.5 volt battery and three 1 ohm resistances (bulbs) in series?

0.5A

KΩ multiplies Ω by

1,000

The term "milliamp" means ___________ of an amp.

1/1000th

The formula for total capacitance of capacitors connected in series

1/CT=1/C1+1/C2+1/C3+...

The formula for total resistance for resistors in parallel is

1/RT=1/R1+1/R2+1/R3+...

What is the total current in a parallel circuit with branches with currents of 42mA and 128 mA?

170mA

Determine the amount of power absorbed in a circuit if a 6V battery is used and a 3A of current is flowing in the circuit?

18 Watts

What is the current flowing through each of the two 10Ω resistors in problem #16?

1A, 1A

Current through a 100Ω resistor that is to be used in a circuit is 0.15A. What is the power being absorbed by the resistor?

2.25 Watts

If four 10Ω resistors are in parallel, the total resistance is

2.5Ω

A circuit has a current of 2.15 A flowing through it. How many milliamps (mA) does that equal?

2150 mA

A resistor's first three color bands are: red, yellow, and black. What is its value?

24Ω

If a circuit has 12V and 3 resistors in series equal to 1Ω, 2Ω, and 3Ω, what is the current flowing in the circuit?

2A

mF moves the decimal point

3 places forward

A transistor is a

3-terminal device

A 120Ω and a 40Ω resistor are in parallel. What is the equivalent resistance?

30Ω

A circuit has 3.2A and 110V. Determine its power.

352 Watts

A transformer which has 1380 turns in its primary coil is to be used to convert the mains voltage of 230 V to operate a 6 V bulb. How many turns should the secondary coil of this transformer have?

36 turns

The voltage across the secondary coil of a transformer with a primary coil with 180 turns, a primary voltage of 12V, and a secondary coil with 540 turns is

36V

How much current flows in a circuit with a 18-volt battery and six 1 ohm resistors (bulbs) in series?

3A

A series circuit contains five resistors. The total resistance for the circuit is 186Ω. The values of four of the resistors are:20Ω,14Ω,10Ω and 100Ω. What is the value of fifth resistor?

42Ω

If a circuit has 12V and 3 resistors in series equal to 1Ω, 2Ω, and 3Ω, what is the voltage drop across each resistor in the circuit?

4V, 6V, and 2V

What tolerance does a gold band represent?

5%

Convert 540,000,000 into its corresponding scientific notation.

54 x 10^7

What is the current flowing in a 20Ω resistor, when the voltage E=120 volts?

6 amps

µAmperes moves the decimal point

6 places forward

AC frequency in the US is

60 Hz

If you have two 3000 ohm resistors in series, what is the total resistance?

6kΩ

Which of the following choices from highest to lowest capacitances is the correct one?

700 pF<700 µF<700mF<700F

A tolerance of ± 20% on a 1000 kΩ resistor is

800 kΩ to 1200 kΩ

What is the total resistance in a circuit which contains 20Ω, 20Ω and 40Ω resistors in series?

80Ω

A resistor's first three color bands are: white, brown, and red. What is its value?

9.1kΩ

What is the primary voltage applied to a transformer with a 15 ohm resistor, a 1.2A current, and a 5:1 coil ratio?

90V`

Convert 95KΩ to Ω.

95,000Ω

What are the effects of moving a closed wire loop through a magnetic field?

A voltage is induced in the wire, a current is induced in the wire, and the polarity of the voltage across the wire depends on the direction of motion

Will a transformer work with direct current (DC) or alternating current (AC)?

AC only

How do you find the current flowing through resistors connected in parallel?

Add the resistances and then use each individual resistance and that total to create a ratio, then multiply the ratio by the main current.

What is an acronym for the order of the colors on a resistor's bands?

BBROYGBVGW

Constant flow of electrons in one direction in an electrical circuit is called a

DC current

What is Ohm's law?

E=IR

Put the sub-units of F in order from least to greatest.

F<mF<µF<pF

What causes magnetism?

Movement of electrons around the nucleus and spinning around their own axis.

The ___________ contains the general rules and regulations that contractors, builders, and manufacturers must follow for proper installation and routing of wires.

National Electric Code

For the circuit shown here, which statement is true?

R5 is in parallel with R6 and R7 (which are in series)

What is the formula for total resistance in series?

RT=R1+R2+R3+...

What happens when you turn off the current in an electromagnet?

The magnetism is turned off

Given a series circuit containing resistors of different values, which statement is not true?

The voltage drop across each resistor is the same.

T/F: Tungsten is used to make light-bulb filaments.

True

Which of the following best describes the difference between wet cells and dry cells?

Wet cells have a liquid electrolyte, while in dry cells the electrolyte is a moist paste.

A ferromagnetic material is

a material that shows strong magnetic effects

What would result in greater magnetic field around a coil of wire?

adding more loops of wire

In a series connected circuit with 100 Christmas bulbs, if one bulb burns out, what happens to the remaining bulbs?

all bulbs turn off

AC generators are also called ___________, since they produce an alternating current.

alternators

Which amongst the following choices listed is NOT attracted to a magnet?

aluminum

The positive end of a diode is called the ___________ and the negative end is called the ___________.

anode, cathode

You can tell if an object is magnetic if the groupings of atoms

are lined up in the same direction

The smaller the gauge (AWG number) of a wire the ___________ the size of the wire.

bigger

In what order from 0-9 do the colors go on a resistor's bands?

black, brown, red, orange, yellow, green, blue, violet, gray, white

Commonly used transistor/s is/are

both A & B

A thermistor

changes resistance with changes in temperature

Safety-devices in electrical circuits are

circuit breakers, fuses, and ground-fault interrupters

An ammeter measures

current

What determines if resistor connections are in series, parallel, or series-parallel?

current flow

If the resistance in a circuit decreases while the voltage stays the same, what happens to the current?

current increases

As additional resistors are connected to a parallel circuit, the total resistance will

decrease

Increasing the number of turns of wire on the secondary of a transformer will

decrease the secondary current and increase the primary current

The first goal(s) to accomplish in analyzing a complex series-parallel circuit is to

determine the total resistance and the main current first

If the circuit is in series, the voltage drop is ___________ across all resistors.

different

If the circuit is in parallel, the current ___________ for each branch, depending on

different, the resistance of the individual branches

Never touch a capacitor without first ___________ it.

discharging

Advantages of digital meters over analog meters are

display, accuracy, and no ambiguity

What is the most common electric shock-related injury?

electrical burns

The device that produces electricity from chemical reaction is called an

electrochemical cell

Death caused by an electric shock is called

electrocution

Liquid in the cell is called an

electrolyte

Which of the following capacitors is polarized?

electrolytic

___________ is the generation of current due to relative motion between a wire and a magnetic field.

electromagnetic induction

An N-type semiconductor has an excess of

electrons

At its most basic level, a battery is a can full of chemicals that produces

electrons

The terminals of a BJT transistor are called

emitter, base, and collector

The (4) basic parts of a circuit are:

energy source, switch, conductive path, and load

What is it that does not affect the amount of current flow induced by magnetism?

environment

T/F: A car battery uses zinc paste as its electrolyte.

false

The unit of inductance is

henry

The faster the coil of a generator rotates through the magnetic field, the

higher the output voltage

A P-type semiconductor has an excess of

holes

A(n) ___________ is used to measure the specific gravity of the acid used in a storage battery.

hydrometer

If the voltage in an electrical circuit containing a lightbulb is increased, what happens to the brightness of the bulb?

increases

Atoms that lose or gain electrons become

ions

What are atoms of the same element having the same number of protons but different number of neutrons called?

isotopes

What happens to total resistance in a circuit with parallel resistors if one of them opens?

it increases

The unit of energy is

joules

Electric companies base their bills on a unit called the

kilowatt-hour

A photovoltaic material is one which converts

light energy into electricity

Naturally occurring magnets in nature are called

lodestones

Fuses are made from materials which have a ___________ melting point.

low

If you measured your body resistance while your palms were damp, your ohmmeter would get a ___________ reading than if measured with your palms dry.

lower

Soldering is the process of joining metals using another metal that has a ___________ melting point.

lower

This is a force where objects are attracted or repelled to one another

magnetism

One way to stop the flow of electrons is to ___________ the circuit.

open

A voltmeter is always connected in ___________ with the other components in an electrical circuit.

parallel

A magnet made of a material that keeps its magnetism is known as a

permanent magnet

Which is an example of a variable resistor?

potentiometers

Piezoelectricity is electricity generated from

pressure

What is the equation to calculate the primary or secondary voltage/number of turns in a step-up/step-down transformer?

primary # of turns/secondary # of turns=primary voltage/secondary voltage (NP/NS=VP/VS)

One of the materials used to produce electricity by pressure is

quartz

Converting AC to DC is accomplished by the process of

rectification

If two magnets were in this order: NS SN, they would

repel

An ohmmeter measures

resistance

What device inhibits/resists the flow of current in a circuit?

resistor

When the current through a coil reverses direction, the magnetic field around the coil

reverses its direction

The best insulators are:

rubber, mica, and plastic

How do you make an electromagnet?

run current through a wire wrapped around an iron rod

Nickel-Cadmium, Lithium ion, and nickel-metal hydride cells are

secondary cells

An ammeter is always connected in ___________ with the other components in an electrical circuit.

series

Which of the following statements describes a good solder joint?

shiny, smooth, and a concave fillet

Identify the semiconductor.

silicon

An integrated circuit is made on a ___________ piece of silicon called the chip.

single

Electrical soldering is also called ___________ soldering.

soft

Devices used to convert solar energy to electricity are called

solar cells

A soldering iron or a soldering gun tip is tinned by coating its surfaces with

solder

Choose the magnetic materials.

steel and iron

In a transformer, the primary coil has twice as many loops as the secondary coil. This is a ___________ transformer.

step-down

A capacitor

stores energy or charges

Copper is a good conductor of electricity because

there are many free electrons present in this metal

Soft solder is an alloy of ___________ and ___________.

tin, lead

The last stripe on a color coded resistor indicates the

tolerance

What do the gold or silver bands on a resistor represent?

tolerance

T/F: A P-type semiconductor material has a shortage of electrons with vacancies called holes.

true

T/F: A schematic is used instead of a complex, detailed drawing of an electrical circuit.

true

T/F: According to the principle of electromagnetic induction, a generator produces voltage when there is a changing magnetic field.

true

T/F: Addition of impurities to the pure semiconductor is called doping.

true

T/F: All electrical circuits have to be grounded.

true

T/F: An inductor is an element which is a coil of wire wound around an iron core.

true

T/F: Conductance is the reciprocal of resistance in a circuit.

true

T/F: For a transformer, power is conserved at the primary (input) and at the secondary (output).

true

T/F: Grounding involves providing a conductor to carry current into the ground rather than into a body.

true

T/F: If resistors in parallel have equal value, their total resistance is half the value of one resistor.

true

T/F: If you add up the currents of each resistor for resistors in parallel, the total is equal to the main current of the circuit.

true

T/F: Increasing the current flowing through a coil increases the magnetic field strength.

true

T/F: Inductors add up like resistors in series and parallel.

true

T/F: It is dangerous to charge a non-rechargeable battery.

true

T/F: It takes less than 1A of current to kill you if it travels through your heart.

true

T/F: It's always important to replace a blown out fuse with the proper one.

true

T/F: Magnetic flux flows from the North Pole to the South Pole.

true

T/F: Materials that lose magnetism quickly are called "soft magnets".

true

T/F: Nichrome is used as a heating element.

true

T/F: Organic LED's give off very nice vibrant colors and are flexible.

true

T/F: Rosin core solder should be used for all electrical soldering.

true

T/F: Semiconductors are materials that have conductivity in between conductors and insulators.

true

T/F: The operation of an electrical generator relies on electromagnetic induction.

true

T/F: The size of an integrated circuit is part of the reason for the importance of ICs in electronics.

true

T/F: The two basic multi-meters are analog and digital.

true

T/F: The voltage drops of resistors in series equal the total voltage/starting voltage.

true

T/F: Wearing safety glasses is very important while soldering.

true

T/F: When using an analog meter to measure unknown currents or voltages, always start with the range selector switch set at the highest position.

true


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