Practice Circuit in Physics

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

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Quick Recap

An electrical circuit is a closed path through which electric current flows from a power source, through components, and back to the source.

A circuit is a complete loop — like a circular track that electrons run around. Break the loop and everything stops.

Showing a random 20 of 50 problems.

Example 1

easy
Name the three basic parts every simple circuit needs.

Example 2

easy
A simple circuit has a 9 V9 \text{ V} battery and a 3 Ω3 \text{ } \Omega resistor. What is the current in the circuit? What happens if the circuit wire is cut?

Example 3

easy
In a series circuit, if one bulb burns out, what happens to the others?

Example 4

easy
A lamp draws 0.50.5 A from a 1212 V source. Find its resistance.

Example 5

hard
A circuit has a 24 V24 \text{ V} battery with internal resistance r=1 Ωr = 1 \text{ } \Omega connected to an external resistance R=11 ΩR = 11 \text{ } \Omega. What is the current, the terminal voltage of the battery, and the power dissipated internally?

Example 6

medium
A circuit has a 9 V9 \text{ V} battery and a 15 Ω15 \text{ } \Omega resistor. Find the current flowing and the power consumed.

Example 7

medium
In a single loop, a switch in series is closed. With a 1010 V source and 5 Ω5\,\Omega load, what current flows?

Example 8

medium
In a series circuit, Vtotal=24V_{total} = 24 V across two resistors R1=4 ΩR_1 = 4\ \Omega and R2=8 ΩR_2 = 8\ \Omega. Find the current.

Example 9

hard
A 1212 V source drives current through a 6 Ω6\ \Omega resistor in series with a parallel pair of 4 Ω4\ \Omega and 4 Ω4\ \Omega. Find the total current.

Example 10

medium
In a single loop, a switch is added in series with the load. With the switch open, what is the current and the voltage across the open switch?

Example 11

medium
A circuit has a battery, a closed switch, and a bulb, but the bulb does not light. The wires are fine. What single fault best explains this?

Example 12

easy
A switch is open in a single-loop circuit. Does current flow?

Example 13

medium
A circuit accidentally shorts across a 1212 V battery with wire of 0.1 Ω0.1\,\Omega. Estimate the current.

Example 14

easy
Which is conserved at every junction in a circuit?

Example 15

medium
Two paths connect the same two nodes, each carrying current independently. Is this series or parallel, and what is shared?

Example 16

hard
A short circuit forms across a battery. What approximately happens to the current?

Example 17

challenge
A circuit draws 1.51.5 A from a 66 V battery for 44 minutes. How much energy does it deliver, in joules?

Example 18

medium
Two 3 Ω3\ \Omega resistors are in series across a 1212 V battery. Find the current.

Example 19

medium
A circuit has a 12 V12 \text{ V} battery, a 4 Ω4 \text{ } \Omega resistor and a 6 Ω6 \text{ } \Omega resistor in series, with a switch. When the switch is closed, what is the current and the voltage across each resistor?

Example 20

easy
Two bulbs are wired so that all current passes through both in turn. Is this series or parallel?
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