Deck 6: Electricity

Question 1

A neutral atom that gains one or more electrons is called a (an)

A)negative ion.
B)positive ion.
C)de-ionized atom.
D)positron.

Answer 1

A

Question 2

The attractive force between two unlike charges has the same strength as the repulsive force between two like charges.

Answer 2

True

Question 3

Electric field lines are drawn

A)toward the positive test charge.
B)away from the positive test charge.
C)in such a way as to show the direction of the field.
D)radiating outward like spokes on a wheel.

Answer 3

C

Question 4

Charge moving through a wire produces a magnetic field around the wire.

Question 5

The electrical force is much weaker than the force of gravity.

Question 6

The reading on your electric bill shows the amount of power you have used in a month.

Question 7

The north end of a suspended magnet will point to the magnetic north pole.

Question 8

If you multiply amp * ohm, the answers will be in units of

A)power.
B)potential.
C)current.
D)resistance.

Question 9

If you double the distance between two charged objects, you reduce the electrical force by a factor of four.

Question 10

Electrons move from the power plant to homes in an alternating current.

Question 11

When a switch is closed in a DC electrical circuit,

A)electrons flow through the conductor at a very slow speed.
B)the electric field moves through the conductor at nearly the speed of light.
C)the current flow is proportional to the potential difference.
D)All of the above.

Question 12

The unit of electric potential difference between two points is

A)an ampere.
B)a coulomb.
C)a joule.
D)a volt.

Question 13

The unit of electric charge is called a (an)

A)electron.
B)ampere.
C)coulomb.
D)ohm.

Question 14

The volt is a measure of the difference in electrical potential energy between two points.

Question 15

The resistance of a wire depends on

A)the length of the wire.
B)the cross-sectional area of the wire.
C)the temperature of the wire.
D)All of the above.

Question 16

What is it that travels through an electric circuit at near the speed of light?

A)electrons
B)protons
C)a potential difference
D)an electric field

Question 17

An electric current is measured in units of

A)volt.
B)amp.
C)watt.
D)coulomb.

Question 18

An electric current is a (an)

A)movement of electrons at near the speed of light.
B)flow of charge.
C)electrical equivalent of gravitational potential difference.
D)measured in joules per coulomb.

Question 19

An object becomes positively charged by gaining protons.

Question 20

Thomas Edison argued that our electrical system should use direct current because he felt that alternating current was dangerous.

Question 21

The rate of flow of electric charge is measured in

A)coulombs.
B)watts.
C)joules.
D)amperes.

Question 22

What is the voltage in the secondary coil if the primary coil is supplied with 120 V?

A)120 V
B)60 V
C)240 V
D)480 V

Question 23

Which of the following unit is actually a measure of a rate?

A)volt
B)coulomb
C)amp
D)ohm

Question 24

An electric field

A)has strength, but not direction.
B)is present only around stationary electric charges.
C)is always present around an electron.
D)cannot exist unless a magnetic field is also present.

Question 25

Electric power is measured in units of

A)volts.
B)amps.
C)ohms.
D)watts.

Question 26

Electrical resistance is a property of conductors that is measured in units of

A)coulomb.
B)volt.
C)amp.
D)ohm.

Question 27

Ohm's law states

A)a relationship between voltage, current, and charge.
B)that less current flows when a higher voltage is applied.
C)that for constant voltage, a greater resistance means more current will flow.
D)that the current in a circuit increases if the potential difference increases.

Question 28

What is the current in the secondary if the current is the primary coil is 5.0 A?

A)2.5 A
B)5.0 A
C)10.0 A
D)20.0 A

Question 29

A magnetic field

A)is produced by an excess of stationary electric charges.
B)is produced by a deficiency of stationary electric charges.
C)is produced by moving charges.
D)attracts or repels stationary electric charges.

Question 30

If you were to mechanically rotate the armature in an electric motor

A)the motor would burn out.
B)the motor would behave like a generator.
C)the motor would become magnetized.
D)nothing would happen.