### All High School Physics Resources

## Example Questions

### Example Question #1 : Using Ohm's Law

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

**Possible Answers:**

**Correct answer:**

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 #2 : Electric Circuits

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

**Possible Answers:**

**Correct answer:**

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 #3 : Electric Circuits

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

**Possible Answers:**

**Correct answer:**

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 #4 : Electric Circuits

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

**Possible Answers:**

**Correct answer:**

For this problem, use Ohm's law: .

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

### Example Question #6 : 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?

**Possible Answers:**

**Correct answer:**

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 #5 : Electric Circuits

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

**Possible Answers:**

**Correct answer:**

For this problem use Ohm's law:

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

### Example Question #6 : Electric Circuits

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

**Possible Answers:**

**Correct answer:**

For this problem use Ohm's law:

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

### Example Question #2 : Using Ohm's Law

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

**Possible Answers:**

**Correct answer:**

For this problem use Ohm's law:

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

### Example Question #3 : Using Ohm's Law

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

**Possible Answers:**

**Correct answer:**

For this problem use Ohm's law:

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

### Example Question #4 : Using Ohm's Law

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?

**Possible Answers:**

There is insufficient information to solve

**Correct answer:**

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.