Question 1

The electric power supplied to a lamp that carries 2 A at 120 V is

Accepted Answer

A) 1/6 watts. 
B) 2 watts. 
C) 60 watts. 
D) 20 watts. 
E) 240 watts. 
A) 1/6 watts. 
B) 2 watts. 
C) 60 watts. 
D) 20 watts. 
E) 240 watts. E

Question 2

By convention, the direction of current in a circuit is

Accepted Answer

A) from the positive terminal of a source to the negative terminal. 
B) the direction in which positive charge flows. 
C) both of these 
D) neither of these 
A) from the positive terminal of a source to the negative terminal. 
B) the direction in which positive charge flows. 
C) both of these 
D) neither of these C

Question 3

To connect a pair of resistors so their equivalent resistance (the single resistor having their combined value)will be least, connect them in

Accepted Answer

A) series. 
B) parallel. 
C) either of these 
A) series. 
B) parallel. 
C) either of these B

Question 4

Voltage is most similar to

Accepted Answer

A) pressure. 
B) current. 
C) resistance. 
D) all of the above 
E) none of the above 
A) pressure. 
B) current. 
C) resistance. 
D) all of the above 
E) none of the above

Question 5

When we say an appliance "uses up electricity," we mean

Accepted Answer

A) current disappears. 
B) electric charges are dissipated. 
C) voltage is lowered. 
D) electric energy dissipates into heat. 
A) current disappears. 
B) electric charges are dissipated. 
C) voltage is lowered. 
D) electric energy dissipates into heat.

Question 6

Just as in hydraulic circuits there is water pressure, in electric circuits there is

Accepted Answer

A) current. 
B) voltage. 
C) resistance. 
A) current. 
B) voltage. 
C) resistance.

Question 7

To connect a pair of resistors so their equivalent resistance (the single resistor having their combined value)will increase, connect them in

Accepted Answer

A) series. 
B) parallel. 
C) either of these 
A) series. 
B) parallel. 
C) either of these

Question 8

The safety fuse in an electric circuit is connected to the circuit in

Accepted Answer

A) series. 
B) parallel. 
C) either series or parallel. 
A) series. 
B) parallel. 
C) either series or parallel.

Question 9

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

Accepted Answer

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

Question 10

Electrons flow in an electrical circuit by

Accepted Answer

A) being bumped by other electrons. 
B) colliding with molecules. 
C) interacting with an established electric field. 
D) none of the above 
A) being bumped by other electrons. 
B) colliding with molecules. 
C) interacting with an established electric field. 
D) none of the above

Question 11

The current drawn by a 1200-W toaster connected to 120 V is 10 A. The resistance of the toaster coils is

Accepted Answer

A) 6 ohms. 
B) 12 ohms. 
C) 18 ohms. 
D) none of the above 
A) 6 ohms. 
B) 12 ohms. 
C) 18 ohms. 
D) none of the above

Question 12

A 60-W and a 100-W light bulb are rated at 120V. Which bulb has a higher resistance?

Accepted Answer

A) 60-W bulb 
B) 100-W bulb 
C) both the same. 
A) 60-W bulb 
B) 100-W bulb 
C) both the same.

Question 13

An electric heater is rated 300W 110V. The safety fuse in the circuit can withstand 15 A of current. How many heaters can be safely operated in the circuit?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
E) more than 5 
A) 2 
B) 3 
C) 4 
D) 5 
E) more than 5

Question 14

A 100-W lamp glows brighter than a 25-W lamp. The electrical resistance of the 100-W lamp is

Accepted Answer

A) less. 
B) greater. 
C) the same. 
A) less. 
B) greater. 
C) the same.

Question 15

On some early automobiles both headlights failed when one bulb burned out. The headlights were likely connected in

Accepted Answer

A) parallel. 
B) perpendicular. 
C) series. 
D) haste. 
A) parallel. 
B) perpendicular. 
C) series. 
D) haste.

Question 16

A heater draws 20A when connected to a 110-V line. If the electric power costs 20 cents per kilowatt hour, the cost of running the heater for 10 hours is

Accepted Answer

A) $0.44. 
B) $1.10. 
C) $4.40. 
D) $11.00. 
E) none of the above 
A) $0.44. 
B) $1.10. 
C) $4.40. 
D) $11.00. 
E) none of the above

Question 17

The equivalent resistance of any series of resistors 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 18

The power dissipated in a 4-ohm resistor carrying 3 A is

Accepted Answer

A) 7 W. 
B) 18 W. 
C) 36 W. 
D) 48 W. 
E) need more information 
A) 7 W. 
B) 18 W. 
C) 36 W. 
D) 48 W. 
E) need more information

Question 19

It is correct to say that in electric circuits

Accepted Answer

A) charge flows through a circuit. 
B) flowing charge is current. 
C) voltage is applied across a circuit. 
D) voltage is the ratio of energy per charge. 
E) all of the above 
A) charge flows through a circuit. 
B) flowing charge is current. 
C) voltage is applied across a circuit. 
D) voltage is the ratio of energy per charge. 
E) all of the above

Question 20

The current in two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is

Accepted Answer

A) 22 ohms. 
B) 44 ohms. 
C) 220 ohms. 
D) 440 ohms. 
E) none of the above 
A) 22 ohms. 
B) 44 ohms. 
C) 220 ohms. 
D) 440 ohms. 
E) none of the above

Exam 23: Electric Current

The electric power supplied to a lamp that carries 2 A at 120 V is

By convention, the direction of current in a circuit is

To connect a pair of resistors so their equivalent resistance (the single resistor having their combined value)will be least, connect them in

Voltage is most similar to

When we say an appliance "uses up electricity," we mean

Just as in hydraulic circuits there is water pressure, in electric circuits there is

To connect a pair of resistors so their equivalent resistance (the single resistor having their combined value)will increase, connect them in

The safety fuse in an electric circuit is connected to the circuit in

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

Electrons flow in an electrical circuit by

The current drawn by a 1200-W toaster connected to 120 V is 10 A. The resistance of the toaster coils is

A 60-W and a 100-W light bulb are rated at 120V. Which bulb has a higher resistance?

An electric heater is rated 300W 110V. The safety fuse in the circuit can withstand 15 A of current. How many heaters can be safely operated in the circuit?

A 100-W lamp glows brighter than a 25-W lamp. The electrical resistance of the 100-W lamp is

On some early automobiles both headlights failed when one bulb burned out. The headlights were likely connected in

A heater draws 20A when connected to a 110-V line. If the electric power costs 20 cents per kilowatt hour, the cost of running the heater for 10 hours is

The equivalent resistance of any series of resistors in a circuit is

The power dissipated in a 4-ohm resistor carrying 3 A is

It is correct to say that in electric circuits

The current in two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is

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