AP Physics 1 : Current and Voltage

Study concepts, example questions & explanations for AP Physics 1

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Example Questions

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Example Question #21 :Current And Voltage

Parallel circuit

What is the current in the given circuit if,and?

Possible Answers:

Correct answer:

Explanation:

To find the current we must first find the equivalent resistance. For resistors in parallel, the equivalent resistance is

For this problem

Now we use Ohm's law,, to find the current,

Example Question #22 :Current And Voltage

What is the current in the given circuit if,,and?

Possible Answers:

Correct answer:

Explanation:

To find the current we must first find the equivalent resistance. This problem is a combination of resistors in series and parallel. First we find the equivalent resistance of resistors in series.

For resistors in series, the equivalent resistance is:

For this problem

The resistors in series can be treated as oneresistor. Now we address the resistors in parallel. For resistors in parallel, the equivalent resistance is:

For this problem

Now we use Ohm's law,, to find the current,

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