1. Compared to insulators, metals are better
conductors of electricity because metals contain
more free
(1) protons
(3) positive ions
(2) electrons
(4) negative ions
6. If 10. coulombs of charge are transferred
through an electric circuit in 5.0 seconds, then
the current in the circuit is
(1) 0.50 A
(3) 15 A
(2) 2.0 A
(4) 50. A
2. Charge flowing at the rate of 2.50 × 1016
elementary charges per second is equivalent to a
current of
(3) 4.00 × 10–3 A
(1) 2.50 × 1013 A
(4) 2.50 × 10–3 A
(2) 6.25 × 105 A
7. During a thunderstorm, a lightning strike
transfers 12 coulombs of charge in 2.0 × 10–3
second. What is the average current produced in
this strike?
(3) 6.0 × 103 A
(1) 1.7 × 10–4A
(4) 9.6 × 103 A
(2) 2.4 × 10–2A
3. The current through a lightbulb is 2.0 amperes.
How many coulombs of electric charge pass
through the lightbulb in one minute?
(1) 60. C
(3) 120 C
(2) 2.0 C
(4) 240 C
4. A 1.5-volt, AAA cell supplies 750 milliamperes
of current through a flashlight bulb for 5.0
minutes, while a 1.5-volt, C cell supplies 750
milliamperes of current through the same
flashlight bulb for 20. minutes. Compared to the
total charge transferred by the AAA cell through
the bulb, the total charge transferred by the C
cell through the bulb is
(1) half as great
(3) the same
(2) twice as great
(4) four times as great
5. The current traveling from the cathode to the
screen in a television picture tube is 5.0 × 10
–5
ampere. How many electrons strike the screen
in 5.0 seconds?
(3) 1.6 × 1015
(1) 3.1 × 1024
(2) 6.3 × 1018
(4) 1.0 × 105
8. A charge of 5.0 coulombs moves through a
circuit in 0.50 second. The current in the circuit
is
(1) 2.5 A
(3) 7.0 A
(2) 5.0 A
(4) 10. A
9. A current of 3.0 amperes is flowing in a circuit.
How much charge passes a given point in the
circuit in 30. seconds?
(1) 0.10 C
(3) 33 C
(2) 10. C
(4) 90. C
10. A wire carries a current of 2.0 amperes. How
many electrons pass a given point in this wire in
1.0 second?
(3) 1.3 × 1019
(1) 1.3 × 1018
(2) 2.0 × 1018
(4) 2.0 × 1019
Answer Key
10 mc on current [Mar 11, 2010]
1.
2
2.
3
3.
3
4.
4
5.
3
6.
2
7.
3
8.
4
9.
4
10.
3