ELE 100 Final Exam

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5 band resistor, value = 82.5K O. First four bands?

Gray - Red - Green - Red

A 56 KO resistor would have what three colors on its first 3 bands?

Green - Blue - Orange

Electric companies base their bills on the unit called

Kilowatt-hour

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

National Electric code

Direction of electron flow in a circuit is always from ____________

Negative to Positive

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

Zero

+ and - are called what?

Terminals

Liquid in the cell is called what?

an electrolyte

What is a thermistor?

changes resistance with changes in temperature

Unit of power

Watts

Advantages of digital meters over analog meters are_________________.

display, accuracy and no ambiguity

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?

42 Ohms

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

6 Amps

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

6 k ohms

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

700 pF < 700 μF < 700 mF < 700 F

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

800 kΩ to 1200 kΩ

White - Brown - Red. What is the value>

9.1K O

A ferromagnetic material is:

A material that shows strong magnetic affects

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

Adding more loops of wire

Naturally occurring magnets in nature are called:

Lodestones

Fuses are made from materials, which have a _____________ melting point.

Low Melting point

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

What is a generator?

Machine that generates electricity to magnetism

Whats a hydrometer?

Measures specific gravity of the acid

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

Safety-devices in electrical circuits are ________________

Circuit-breakers, Fuses and Ground-fault interrupters

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

False

Device that produces electricity from chemical reaction?

Electrochemical Cell

What capacitor is polarized?

Electrolytic

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

Electrons

The 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

A group of batteries make up a cell.

False

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

False

Wet conditions decrease the risk of electric shock by lowering the skin resistance.

False

Unit for capacitance

Farads

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

False

An electromagnet is a permanent magnet.

False

Dry cells are normally used in cars and trucks

False

Whats a capacitor?

Stores energy

If two wires have the same cross-sectional area and made from the same material, the longer wire will have the lesser resistance

False

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

False

Insulators offer very less resistance to the flow of electricity.

False

The 4th stripe in five band resistor inidicates tolerance.

False

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

352 Watts

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

.33 Amps

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

0.5 A

A resistors first three bands are: Brown - Black - Black. What is the value?

10 Ohms (Upside down horseshoe)

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

11 V

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 Watts

What is the total resistance of the circuit shown below?

2.5 O

3 bands, Red - Yellow - Black. What is the value?

24 O

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

27 mW

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

30 O

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

Aluminum

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

Bigger

Ammeter measures what?

Current

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

Current Flow

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

DC Current

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

Decrease

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

Determine the total resistance and the main current first.

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

Unit of Energy

Joules

Identify the non-renewable energy resource

Nuclear

Chain reaction can be seen in ____________.

Nuclear Power Plant

Atomic Massis deined as the mass of a ___________-

Nucleus

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

Ohm's Law

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

Permanent Magnet

Example of a variable Resisitor

Potentionmeters

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QUIZ 2 NOW

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QUIZ 3 NOW

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QUIZ 4 NOW

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QUIZ 5 NOW

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QUIZ 6 NOW

Ohmmeter measures what?

Resistance

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

How do you make an electromagnet?

Run current through a wire wrapped around an iron rod

Which of the following statements describes a good solder joint?

Smooth and shiny

When the plate area of a capacitor increases,

The capacitance increases

An object is not magnetized if:

The grouping of atoms are scattered

The voltage across any branch of a parallel circuit is_____________.

The same as other parallel elements

Why is copper a good conductor of electricity?

There are many free electrons present

Soft solder is an alloy of ______________

Tin & Lead

All electrical circuits have to be grounded

True

Analog and digital are most common

True

Grounding involves providing a conductor to carry current into the ground rather than into a body

True

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

True

Tungsten is used to make light bulbs

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

What color is never used?

Turquoise

Unit of Voltage

Volts

3 best insulators

rubber, mica, plastic

3 factors that affect capacitance

surface area, distance between plates, and insulating material


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