Practice Circuit in Physics
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
A closed loop of conducting material through which electric current can flow, typically including a power source and one or more components.
A circuit is a complete loop — like a circular track that electrons run around. Break the loop and everything stops.
Example 1
easyA simple circuit has a 9 \text{ V} battery and a 3 \text{ } \Omega resistor. What is the current in the circuit? What happens if the circuit wire is cut?
Example 2
mediumA circuit has a 12 \text{ V} battery, a 4 \text{ } \Omega resistor and a 6 \text{ } \Omega resistor in series, with a switch. When the switch is closed, what is the current and the voltage across each resistor?
Example 3
mediumA circuit has a 9 \text{ V} battery and a 15 \text{ } \Omega resistor. Find the current flowing and the power consumed.
Example 4
mediumA circuit has a battery and three identical bulbs. Two bulbs are in parallel with each other, and this parallel pair is in series with the third bulb. If the battery is 6 \text{ V} and each bulb has resistance 6 \text{ } \Omega, what is the current from the battery?
Example 5
hardA circuit has a 24 \text{ V} battery with internal resistance r = 1 \text{ } \Omega connected to an external resistance R = 11 \text{ } \Omega. What is the current, the terminal voltage of the battery, and the power dissipated internally?