High School Physics : Using Ohm's Law

Example Questions

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Example Question #1 : Electricity And Magnetism

What is the voltage of a circuit with  of current and  of resistance?

Explanation:

For this problem, use Ohm's law: . In this equation is the voltage,  is the current, and  is the resistance.

Plug in the given values and solve for the voltage.

Example Question #1 : Electric Circuits

What is the current of a circuit with a voltage of  and a total resistance of ?

Explanation:

For this problem, use Ohm's law: . In this equation is the voltage,  is the current, and  is the resistance.

We can re-arrange the equation to solve specifically for .

Plug in the given values for voltage and resistance to solve for the current.

Example Question #2 : Electricity And Magnetism

What is the resistance in a circuit with a voltage of  and a current of ?

Explanation:

For this problem, use Ohm's law: . In this equation is the voltage,  is the current, and  is the resistance.

We can re-arrange the equation to solve specifically for .

Plug in the given values for voltage and current and solve for resistance.

Example Question #1 : Electric Circuits

battery is connected to a circuit. The measured current is . What is the equivalent resistance?

Explanation:

For this problem, use Ohm's law:

We are given the voltage and current, allowing us to solve for the resistance.

Example Question #1 : Electricity And Magnetism

A closed electric circuit is set up so that there is a current of  and a voltage of . What is the resistance in the circuit?

Explanation:

For this problem, use Ohm's law: .

We are given the current and the voltage. Using these terms, we can solve for the resistance.

Example Question #1 : Electric Circuits

The current in a circuit is . If the voltage is , what is the total resistance?

Explanation:

For this problem use Ohm's law:

We are given the current and the voltage, allowing us to solve for the resistance.

Example Question #7 : Using Ohm's Law

An electrical circuit has a total of  resistance and . What is the current?

Explanation:

For this problem use Ohm's law:

We are given the resistance and the voltage, allowing us to solve for the current.

Example Question #1 : Electric Circuits

An electrical circuit has a current of  and  of resistance. What is the voltage?

Explanation:

For this problem use Ohm's law:

We are given the resistance and the current, allowing us to solve for the voltage.

Example Question #1 : Using Ohm's Law

An electrical circuit has a current of  and  of resistance. What is the voltage?

Explanation:

For this problem use Ohm's law:

We are given the resistance and the current, allowing us to solve for the voltage.

Example Question #2 : Electric Circuits

A circuit has a current, , a voltage, , and a resistance, . If the voltage remains constant, but the current is doubled (), what must the new resistance be?

There is insufficient information to solve

Explanation:

To solve this problem, use Ohm's law:

Since we are doubling the current, but the voltage is remaining the same, we can set our old and new equations equal to each other.

We know that the second current is equal to twice the first current.

Use this equation to substitute current into the first equation.

The initial current now cancels out from both sides.

Divide both sides by two to isolate the final resistance variable.

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