Lesson 1: Ohm’s Law EquationThe relationship between voltage, amperage,

and resistance can be expressed in a simple equation. This equation is known as Ohm’s law.

Ohm’s law is represented by the equation where volts = current × resistance.

This equation often simplified into the expression V = I × R where V = Volts, I = Current, and R = Resistance.

Each quantity is expressed in units. V is expressed in volts. I is expressed in amps, and R is expressed in ohms.

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Lesson 2: Solving for IIn many situations the voltage is nearly

constant.Taking voltage (V) readings is easy because

these readings can be taken with the circuit energized and ready to use.

Using simple algebraic concepts Ohm’s law can be rearranged so we can solve for resistance (R) or current (I).

I can be calculated using the formula I = V ÷ R.

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Lesson 3: Calculating IIt is often practical to calculate I using Ohm’s

law.In order to calculate I, V and R must be

known.V is determined to be 12 volts using a

voltmeter.R is determined to be 3 ohms using an Ohm

meter.I can be calculated using the formula I = V ÷

R.Rewritten for this case the formula is I = 12

÷ 3.I is 4 amps.

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Lesson 4: Solving for RUsing simple algebraic concepts Ohm’s law

can be rearranged so we can solve for resistance (R). This is another case of rearranging the formula for Ohm’s law using simple algebraic principals.

To solve for resistance use the formula: R = V ÷ I

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Lesson 5: Calculating RIt is often practical to calculate R using

Ohm’s law.In order to calculate R, V and I must be

known.V is determined to be 12 volts using a

voltmeter.I is determined to be 2 amps using an Ohm

meter.I can be calculated using the formula R = V ÷

I.Rewritten for this case the formula is R = 12

÷ 6.R is 2 ohms.

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Lesson 6: Calculating VIt is possible to calculate V using Ohm’s law.In order to calculate V, R and I must be

known.R is determined to be 4 ohms using a

voltmeter.I is determined to be 3 amps using an Ohm

meter.V can be calculated using the formula V = I ×

R.Rewritten for this case the formula is V = 3 ÷

4.V is 12 volts.

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HelpLearn Each Lesson Answer Each QuestionRead each lesson.When you are done click

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Press the help button if you need help.

Each question must be answered correctly to continue to the next lesson.

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Question 1: Ohms Law EquationQuestion: Answer:Select the correct

representations of volts, current, and resistance.

V = Volts, I = Resistance, R = Current

V = Volts, I = Current, R = Resistance

V = Resistance, I = Volts, R = Current

V = Current, I = Resistance, R = Volts

Question 2: Solving for IQuestion: Answer:Select the correct

formula for to solve for I. I = V ÷ R

I = R ÷ V

I = V × R

I = V × V

Question 3: Calculating IQuestion: Answer:If V = 12 and R = 1,

select the correct value for I.

12 volts

12 amps

1 amp

6 ohms

Question 4: Solving for RQuestion: Answer:Select the correct

formula for to solve for R.

V = V ÷ R

R = I ÷ V

R = V ÷ I

R = V × I

Question 5: Calculating RQuestion: Answer:If V = 12 and I = 4,

select the correct value for R.

12 volts

4 ohms

3 ohms

1 ohm

Question 6: Calculating VQuestion: Answer:If I = 6 and R = 1, select

the correct value for V. 2 amps

3 ohms

4 volts

6 volts

Question 1: Correct !Please press the next arrow to continue

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Question 2: Correct !Please press the next arrow to continue

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Question 3: Correct !Please press the next arrow to continue

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Question 4: Correct !Please press the next arrow to continue

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Question 5: Correct !Please press the next arrow to continue

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Question 6: Correct !You have completed the Ohm’s law lesson.

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Question 1: Incorrect !This equation often simplified into the

expression V = I × R where V = Volts, I = Current, and R = Resistance.

Remember, V = Volts.R = ResistanceI = Current which does not start with I, but is

the only one that does not match.

Retry

Question 2: Incorrect !Using simple algebraic concepts Ohm’s law

can be rearranged so we can solve for resistance (R) or current (I).

I can be calculated using the formula I = V ÷ R.

Retry

Question 3: Incorrect !I can be calculated using the formula I = V ÷

R.

Retry

Question 4: Incorrect !To solve for resistance use the formula: R = V

÷ I

Retry

Question 5: Incorrect !I can be calculated using the formula R = V ÷

I.

Retry

Question 6: Incorrect !V can be calculated using the formula V = I ×

R.

Retry

More Information: Ohm’s LawOhm’s law is named after Georg Ohm. Georg Ohm was a scientist that performed

electrical experiments in the 1820s. Through hands-on tests and mathematical

calculations Georg discovered that power, voltage, resistance, and current are all related and dependant on each other.

For our purposes, Georg Ohm’s equation is simplified into the expression V = I × R where V = Volts, I = Current, and R = Resistance. Back