ELE 100 Final

Lakukan tugas rumah & ujian kamu dengan baik sekarang menggunakan Quizwiz!

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

0.5 A

A voltmeter is a meter used to measure the

Voltage

Which of the following best describes the differences between wet cells and dry cells

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

Tools used to remove insulation from wires.

Wire strippers and Knives

A 47 K Ω resistor would have which colors on its first 3 bands

Yellow, Violet, Orange

A 470 k Ω resistor would have which colors in its first three bands?

Yellow, Violet, Yellow

Superconductors are materials that exhibit _________ resistance to the flow of electricity

Zero

What would induce a greater electric current in a wire?

adding more loops of wire

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

adding more loops of wire

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

alternators

Liquid in the cell is called

an electrolyte

Ammeter measures

current

Electromagnetic induction is a term used to describe

production of electric potential due to change in magnetic flux

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

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

resistors

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

reverses its direction

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

series

Which sized wire is larger in diameter - #10 or #24?

#10

Express 2.01x10-4 in its normal number notation.

0.000201

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

0.33 Amps

A circuit has three 30 Ω resistors connected in parallel. A voltage source of 30 V is connected across this parallel combination of resistors. What is the current flowing through all three resistors

1A, 1A, 1A

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

18 watts

How do you find the total resistance in a parallel circuit

Total resistance art is the reciprocal of the sum of the reciprocal of all the individuals resistances. 1/Rt = 1/R1 + 1/R2 + 1/R3

A P-type semiconductor material has a shortage of electrons with vaccines called holes

True

A capacitor stores energey

True

According to principal of electro-magnetic induction, Generator produces voltage

True

Addition of impurities to the pure semiconductor is called Doping.

True

All electrical circuits have to be grounded

True

Increasing the current flowing through a coil increases the magnetic field strength

True

Is it dangerous to charge a non-rechargeable battery

True

Magnetic flux flows from the North Pole to the South Pole.

True

Materials that loose magnetism quickly are called "soft magnets"

True

Rosin core solder should be used for all electrical soldering

True

Voltmeters and Ammeters are polarized instruments

True

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

True

Objects with like charges repel and unlike charges attract. The girl's hair and the comb have

Unlike charges

How can you show that electricity creates a magnetic field

Use a compass near a wire with current flowing through it

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

10 KΩ

A circuit had three 30 Ω resistors connected in parallel. What is the total equivalent resistance of this circuit

10 Ω

Is it correct to say that capacitance is inversely proportionally to the area of the parallel plates

False

Resistors connected in series do not share the same current

False

Solid wire is more flexible than stranded wire.

False

Step-up transformers are located near to end user

False

Voltage sources cannot be added in series if they equal values and same polarities

False

When you break a magnet into two, you can separate the two poles

False

The magnetic field strength is weakest at the poles and strongest along the length of the magnet

Galse

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

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

Increases

What is an isotope?

Isotopes of an element share the number of protons but have different numbers of neutrons

Naturally occurring magnets in nature are called

Lodestones

How will an open resistor affect a series circuit?

No current will flow in the circuit

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

Ohm's Law

What types of charges repel

Positive and positive

Atomic number is defined as the number of __________ in an atom

Protons

Which of the following statements describes a good solder joint?

Shiny, smooth and a concave fillet

An integrated circuit is made on a _____ piece of Silicon called the chip

Single

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

Solder

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

Switches

Covert 540,000,000 into its corresponding scientific notation

54x10^7

Death caused by an electric shock is called

Electrocution

Wearing safety glasses is very important while soldering

True

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

Turquoise

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

are lined up in the same direction

Advantages of digital meters over analog meters are

display, accuracy and no ambiguity

An N-type semiconductor has excess of

electrons

A transistor is used for

Switching voltages & currents and also for amplifying small signals into large currents. (Both the above)

The faster the coil of a generator rotates though the magnetic field the

The higher the output voltage

What happens when you turn off the current in an electromagnetic

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.

What value of resistor would produce a current of 3 A in a circuit when a 12 V battery is connected

4 A

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

42 Ω

Which of the following are electrical hazards

All of the above are electrical hazards

The best insulators are;

All of the choices given here

Commonly used transistor

BJT

Identify the semiconductor

Silicon

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

lower

Direction of electron flow in a circuit is always from

negative to positive

Electron is a

negatively charged particle

The term "milliamp" means __________ of an amp.

1/1000 th

Transistor is a

3-terminal device

Ohmmeter measures

resistance

Current does not flow in a forward biased diode.

False

Diode conducts in both directions

False

In a parallel circuit, if one of the bulbs blew out, the other bulb would not be able to light up

False

Insulators offer very less resistance to the flow of electricity.

False

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

11 V

Electrical Generator performs which kind of energy conversion?

mechanical energy to electrical energy

Atomic mass is defined as the mass of a/an ________ of an atom

nucleus

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

permanent magnet

If a battery produced 12.6 Volta and what would be the current flow be for a 6 Ohm resistor

2.1 A

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

2.25 Watt

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

3 A

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

6 Amps

A resistor's first three color bands are; White, Green, Red - What is its value

9.5 KΩ

A ferromagnetic material is

A material that shows strong magnetic effects

ferromagnetic material is

A material that shows strong magnetic effects

What are the effects of moving a close wire loop through a magnetic material

All of the choices listed here

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

Aluminum

You can tell if an object is magnetic if the grouping of atoms______

Are lined up in the same direction

Why do we use an electroscope

Because we want to know it an object is charged or no

A 65 K Ω resistors would have which colors on its first 3 bands

Blue, Green, Orange

When the plate area of a capacitor increases;

Capacitance increases

What is the unit that is used to describe electric charge

Coloumb

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

Determine the total resistance and the main current first

The basic parts of a circuit are

Energy Source, Conductive path, Switch and Load

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

Environment

Ammeters are always connected in parallel in a circuit for measuring the currents.

False

An atom is not electrically neutral

False

An electromagnet is a permanent magnet

False

Atomic number is defined as the number of neutrons in an atom

False

Electrical soldering is also called as____________ soldering

soft

Devices used to convert solar energy to electricity are called

solar cells

choose the magnetic materials

steel and iron

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

terminals

An object is not magnetized if

the groupings of atoms are scattered

The voltage across any branch of a parallel circuit is

the same as the other parallel elements

Soft solder is an alloy of _________& ___________.

tin and lead


Set pelajaran terkait

Pharmacology Chapter 52:Skin Disorder Topical Drugs

View Set

w3schools CSS quiz, W3Schools HTML Quiz

View Set

Chapter 4- Elimination, immunity

View Set

1.3 Given a scenario, perform server hardware maintenance.

View Set

Adult health and peds nclex (copy)

View Set