Lesson Worksheet: Electric Current Physics • 9th Grade

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In this worksheet, we will practice using the formula I = Q/t to calculate the current through a point in simple circuits given the charge moving past that point in a given time.

Q1:

The diagram shows a circuit consisting of a battery and a resistor. The current through the circuit is 50 mA. Over a period of 1.5 hours, how much charge flows past point P in the circuit?

Q2:

A laptop charger passes a current of 5.0 A through a laptop battery. Over a period of time, 45,000 C of charge is transferred to the battery. For how many hours was the laptop left to charge?

Q3:

The diagram shows a circuit consisting of a battery and a resistor. The current through the circuit is 2.0 A. Over a period of 45 seconds, how much charge flows past point P in the circuit?

Q4:

Which of the following is the correct formula for the amount of charge flowing through a point in a circuit in a given time? represents the amount of charge, represents the current, and represents time.

Q5:

Which of the following is the correct unit for electric charge?

AJoule
BAmpere
CCoulomb
DVolt

Q6:

Which of the following is the correct unit for electric current?

AVolt
BAmpere
CJoule
DWatt

Q7:

A rechargeable battery is left to charge for a period of time. It is charged with a current of 10 mA. After it has finished, the battery has gained 180 C of charge. For how many hours was the battery left to charge?

Q8:

Which of the following is the correct formula for the current through a point in a circuit? represents the current, represents the amount of charge, and represents time.

Q9:

The diagram shows a circuit consisting of a battery and a light-emitting diode (LED). Over a period of 25 seconds, a charge of 50 coulombs passes through point in the circuit. What is the current in the circuit during this period?

Q10:

How many milliamperes are there in 1 ampere?

This lesson includes 15 additional questions for subscribers.

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