Using Ohm's law

Instructions:

There are 12 questions.

For the multi-choice questions:

• choose the correct answer
• write down your answer.

For the calculation questions:

• calculate the unknown value
• specify the appropriate unit
• write down your answer.

Note:

• You can print this page and write you answers onto it.
• You can use a calculator.

1. What happens to current flow in a circuit if the circuit voltage is increased?

1. Increases.
2. Decreases.
3. Stays the same.
4. Becomes alternating current (AC).

 

2. What happens to the amount of resistance in a circuit if the circuit voltage is increased?

1. Increases.
2. Decreases.
3. Stays the same.
4. Becomes bypassed (short circuit).

 

3. How can you decrease the current flow in a circuit?

1. Increase circuit voltage.
2. Decrease resistance.
3. Increase resistance.

 

4. What happens to the current flow in a circuit if circuit resistance is decreased?

1. Increases.
2. Decreases.
3. Stays the same.
4. Becomes alternating current (AC).

 

5. How would the amount of current change if the circuit voltage was doubled? (eg raised from 10V to 2V)

1. Halve.
2. Stay the same.
3. Double.
4. Triple.

 

6. How would the amount of current change if the circuit resistance was doubled? (eg raised from 10Ω to 20Ω)

1. Halve.
2. Stay the same.
3. Double.
4. Triple.

 

7. How much current will flow in a circuit with a 240V supply and 40Ω resistance?

 

8. How much resistance is there in a circuit with an 18V supply and 6 amps of current flow?

 

9. What is the voltage supply of a circuit with a current flow of 4.5A and a resistance of 8Ω?

 

10. How much current will flow in a circuit with a 70V supply and 14Ω resistance?

 

11. How much resistance is there in a circuit with a 15V supply and a current flow of 15A?

 

12. What is the voltage supply of a circuit with a current flow of 12A and a resistance of 12Ω?

 

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