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High School Physics : Use Ohm's Law

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Example Questions

Example Question #11 : Use Ohm's Law

Ohm's Law describes the relationship between which variables?

Possible Answers:

Resistance, power, electromotive force

Power, resistivity, electromotive force

Voltage, electric field, power

Electric field, current, power

Voltage, current, resistance

Correct answer:

Voltage, current, resistance

Explanation:

Ohm's law can be written as:

V=IR

It demonstrates that voltage is equal to the product of current and resistance within an electric circuit.

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Example Question #12 : Use Ohm's Law

The current in a circuit is 35A and the voltage is 100V . What is the resistance?

Possible Answers:

$135\: \Omega$

$0.35\: \Omega$

$3500\: \Omega$

$2.86\: \Omega$

Correct answer:

$2.86\: \Omega$

Explanation:

Ohm's law says V=IR . Plug in our given values to solve.

V=IR

100V=35A*R

$\frac{100V}{35A}=R$

$2.86\Omega=R$

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Example Question #13 : Electricity And Magnetism

What is the current of a circuit with a voltage of 12V and a total resistance of $5\Omega$ ?

Possible Answers:

0.42A

60A

2.4A

4.8A

Correct answer:

2.4A

Explanation:

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

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

V/R=I

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

V/R=I

$12V/5\Omega =I$

2.4A=I

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Example Question #14 : Electricity And Magnetism

What is the resistance in a circuit with a voltage of 50V and a current of ?

Possible Answers:

$6.25\Omega$

$58\Omega$

$42\Omega$

$400\Omega$

$0.16\Omega$

Correct answer:

$6.25\Omega$

Explanation:

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

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

V/I=R

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

V/I=R

50V/8A=R

$6.25\Omega =R$

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Example Question #15 : Electricity And Magnetism

What is the voltage of a circuit with 10A of current and $20\Omega$ of resistance?

Possible Answers:

10V

200V

0.5V

30V

Correct answer:

200V

Explanation:

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

Plug in the given values and solve for the voltage.

$V=10A*20\Omega$

V=200V

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Example Question #12 : Use Ohm's Law

Ohm's Law describes the relationship between which variables?

Possible Answers:

Voltage, electric field, power

Electric field, current, power

Resistance, power, electromotive force

Power, resistivity, electromotive force

Voltage, current, resistance

Correct answer:

Voltage, current, resistance

Explanation:

Ohm's law can be written as:

V=IR

It demonstrates that voltage is equal to the product of current and resistance within an electric circuit.

Report an Error

Example Question #17 : Electricity And Magnetism

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

$\frac{1}{2}R$

$\frac{1}{4}R$

Correct answer:

$\frac{1}{2}R$

Explanation:

To solve this problem, use Ohm's law:

V=IR

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.

I_1 R_1 = V = I_2 R_2

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

I_2 = 2 I_1

Use this equation to substitute current into the first equation.

I_1 R_1 = (2I_1) R_2

The initial current now cancels out from both sides.

R1 = 2R_2

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

$\frac{1}{2}R_1 = R_2$

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High School Physics : Use Ohm's Law

Study concepts, example questions & explanations for High School Physics

All High School Physics Resources

Example Questions

Example Question #11 : Use Ohm's Law

Example Question #12 : Use Ohm's Law

Example Question #13 : Electricity And Magnetism

Example Question #14 : Electricity And Magnetism

Example Question #15 : Electricity And Magnetism

Example Question #12 : Use Ohm's Law

Example Question #17 : Electricity And Magnetism

All High School Physics Resources

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