Question 1

Ohm's law tells us that the amount of current produced in a circuit is

Accepted Answer

A) directly proportional to voltage. 
B) inversely proportional to resistance. 
C) both of these 
D) neither of these 
A) directly proportional to voltage. 
B) inversely proportional to resistance. 
C) both of these 
D) neither of these

Question 2

When a pair of identical lamps are connected in parallel

Accepted Answer

A) voltage across each is the same. 
B) current in each is the same. 
C) power dissipated in each is the same. 
D) all of the above 
A) voltage across each is the same. 
B) current in each is the same. 
C) power dissipated in each is the same. 
D) all of the above

Question 3

Two lamps with different filament thicknesses, and therefore different resistances, are connected in series. Greater current is in the lamp with the

Accepted Answer

A) thick filament. 
B) thin filament. 
C) same in each 
A) thick filament. 
B) thin filament. 
C) same in each

Question 4

A coulomb of charge flowing in a bulb filament powered by a 6-volt battery is provided with

Accepted Answer

A) 6 ohms. 
B) 6 amperes. 
C) 6 joules. 
D) 6 watts. 
E) 6 newtons. 
A) 6 ohms. 
B) 6 amperes. 
C) 6 joules. 
D) 6 watts. 
E) 6 newtons.

Question 5

A power line with a resistance of 2 ohms carries a current of 80 A. The power dissipated in the line is

Accepted Answer

A) 40 W. 
B) 160 W. 
C) 320 W. 
D) 12,800 W. 
E) none of the above 
A) 40 W. 
B) 160 W. 
C) 320 W. 
D) 12,800 W. 
E) none of the above

Question 6

The equivalent resistance of any parallel branch in a circuit is

Accepted Answer

A) often less than the resistance of the lowest resistor. 
B) always less than the resistance of the lowest resistor. 
C) usually half the value of the lowest resistor. 
D) none of the above 
A) often less than the resistance of the lowest resistor. 
B) always less than the resistance of the lowest resistor. 
C) usually half the value of the lowest resistor. 
D) none of the above

Question 7

Direct current is normally produced by a

Accepted Answer

A) battery. 
B) generator. 
C) both of these 
D) neither of these 
A) battery. 
B) generator. 
C) both of these 
D) neither of these

Question 8

Which statement is correct?

Accepted Answer

A) charge flows in a circuit 
B) voltage flows in a circuit 
C) resistance flows in a circuit 
D) all of the above 
A) charge flows in a circuit 
B) voltage flows in a circuit 
C) resistance flows in a circuit 
D) all of the above

Question 9

As more lamps are connected in a parallel circuit, the overall current in the power source

Accepted Answer

A) increases. 
B) decreases. 
C) stays the same. 
A) increases. 
B) decreases. 
C) stays the same.

Question 10

The resistance of a filament that carries 2 A when a 10-V potential difference across it is

Accepted Answer

A) 2 ohms. 
B) 5 ohms. 
C) 10 ohms. 
D) 20 ohms. 
E) more than 20 ohms. 
A) 2 ohms. 
B) 5 ohms. 
C) 10 ohms. 
D) 20 ohms. 
E) more than 20 ohms.

Question 11

The equivalent (combined)resistance of 1-ohm, 2-ohm, and 3-ohm in parallel is about

Accepted Answer

A) 0.06 ohm. 
B) 1 ohm. 
C) 1.8 ohms. 
D) 6 ohms. 
E) 9 ohms. 
A) 0.06 ohm. 
B) 1 ohm. 
C) 1.8 ohms. 
D) 6 ohms. 
E) 9 ohms.

Question 12

When Eddie Electron experiences an electrical shock, the source of electrons composing the shock is

Accepted Answer

A) the ground beneath Eddie's feet. 
B) Eddie's body. 
C) the power plant. 
D) whatever electric device being handled. 
E) electric field in the air. 
A) the ground beneath Eddie's feet. 
B) Eddie's body. 
C) the power plant. 
D) whatever electric device being handled. 
E) electric field in the air.

Question 13

Three 10-ohm resistors take the shape of a triangle, one resistor in each leg. Connecting an ohm-meter across any two points of the triangle will show the equivalent resistance to be

Accepted Answer

A) 1.4 ohms. 
B) 5 ohms. 
C) 6.7 ohms. 
D) greater than 6.7 ohms. 
A) 1.4 ohms. 
B) 5 ohms. 
C) 6.7 ohms. 
D) greater than 6.7 ohms.

Question 14

A suitable electric pump in an electric circuit is a

Accepted Answer

A) chemical battery. 
B) generator. 
C) both of these 
D) neither of these 
A) chemical battery. 
B) generator. 
C) both of these 
D) neither of these

Question 15

When you turn on a lamp, the initial current in its filament is greater at first, rather than a moment later, which indicates

Accepted Answer

A) something is faulty. 
B) a time delay for current attaining its average speed. 
C) increased temperature means increased resistance. 
D) nothing of interest 
A) something is faulty. 
B) a time delay for current attaining its average speed. 
C) increased temperature means increased resistance. 
D) nothing of interest

Question 16

Heat a copper wire and its electric resistance

Accepted Answer

A) decreases. 
B) remains unchanged. 
C) increases. 
A) decreases. 
B) remains unchanged. 
C) increases.

Question 17

The amount of current in an incandescent bulb rated 75W 120V is about

Accepted Answer

A) 0.4 A. 
B) 0.6 A. 
C) 1.2 A. 
D) more than 1.2 A. 
A) 0.4 A. 
B) 0.6 A. 
C) 1.2 A. 
D) more than 1.2 A.

Question 18

The amount of current in a CFL rated 23W 120V is about

Accepted Answer

A) 0.2A. 
B) 5.2A. 
C) more than 5.2A. 
A) 0.2A. 
B) 5.2A. 
C) more than 5.2A.

Question 19

If two copper wires of the same length have different thickness, then the thicker wire has

Accepted Answer

A) more resistance. 
B) less resistance. 
C) both the same 
A) more resistance. 
B) less resistance. 
C) both the same

Question 20

A circuit breaker often serves the same purpose as a

Accepted Answer

A) battery 
B) fuse. 
C) capacitor. 
D) all of the above 
E) none of the above 
A) battery 
B) fuse. 
C) capacitor. 
D) all of the above 
E) none of the above

Exam 23: Electric Current

Ohm's law tells us that the amount of current produced in a circuit is

When a pair of identical lamps are connected in parallel

Two lamps with different filament thicknesses, and therefore different resistances, are connected in series. Greater current is in the lamp with the

A coulomb of charge flowing in a bulb filament powered by a 6-volt battery is provided with

A power line with a resistance of 2 ohms carries a current of 80 A. The power dissipated in the line is

The equivalent resistance of any parallel branch in a circuit is

Direct current is normally produced by a

Which statement is correct?

As more lamps are connected in a parallel circuit, the overall current in the power source

The resistance of a filament that carries 2 A when a 10-V potential difference across it is

The equivalent (combined)resistance of 1-ohm, 2-ohm, and 3-ohm in parallel is about

When Eddie Electron experiences an electrical shock, the source of electrons composing the shock is

Three 10-ohm resistors take the shape of a triangle, one resistor in each leg. Connecting an ohm-meter across any two points of the triangle will show the equivalent resistance to be

A suitable electric pump in an electric circuit is a

When you turn on a lamp, the initial current in its filament is greater at first, rather than a moment later, which indicates

Heat a copper wire and its electric resistance

The amount of current in an incandescent bulb rated 75W 120V is about

The amount of current in a CFL rated 23W 120V is about

If two copper wires of the same length have different thickness, then the thicker wire has

A circuit breaker often serves the same purpose as a

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