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 #211 : Electricity And Waves

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 one  resistor. 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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