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Worksheets

Ohms law calculations

Total questions: 20

Worksheet time: 10mins

Name
Class
Date
1.

Which of the following is the correct SI unit for voltage?

a)

Ohm

b)

Volt

c)

Amp

d)

Watt

2.

Which of the following is the correct SI unit for current?

a)

Ohm

b)

Volt

c)

Amp

d)

Watt

3.

Which of the following is the correct SI unit for resistance?

a)

Ohm

b)

Volt

c)

Amp

d)

Watt

4.

Which of the options shown is the correct formula for calculating electrical pressure (Volts)?

a)

Voltage divided by Current

b)

Voltage multiplied by Resistance

c)

Current divided by Resistance

d)

Current multiplied by Resistance

5.

Which of the options shown is the correct formula for calculating current (amps)?

a)

Voltage divided by Resistance

b)

Voltage multiplied by Resistance

c)

Current divided by Resistance

d)

Resistance multiplied by Voltage

6.

Which of the options shown is the correct formula for calculating electrical resistance (Ohms)?

a)

Voltage divided by Current

b)

Voltage multiplied by Resistance

c)

Current divided by Resistance

d)

Current multiplied by Resistance

7.

Which of the following formulas is correct?

a)

V = I x R

b)

V = I/R

c)

V = I + R

d)

V = I - R

8.

Which of the following formulas is correct?

a)

I = V/R

b)

I = V x R

c)

I = V + R

d)

I = V - R

9.

Which of the following formulas is correct?

a)

R = V/I

b)

R = V + I

c)

R = V x I

d)

R = V - I

10.

Using the magic triangle shown calculate the voltage in the circuit when the current = 4 amps and the resistance = 3 ohms

a)

12 volts

b)

7 volts

c)

24 volts

d)

48 volts

11.

Using the magic triangle shown calculate the current flow in the circuit when the voltage = 12v and the resistance = 4Ω

a)

3 amps

b)

16 amps

c)

48 amps

d)

8 amps

12.

Using the magic triangle shown calculate the resistance in the circuit when the voltage = 12v and the current = 6 amps

a)

2 ohms

b)

18 ohms

c)

72 ohms

d)

6 ohms

13.

Using the magic triangle shown calculate the voltage in the circuit when the current = 8amps and the resistance = 3 ohms

a)

12 volts

b)

11 volts

c)

24 volts

d)

48 volts

14.

Using the magic triangle shown calculate the current flow in the circuit when the voltage = 24v and the resistance = 8Ω

a)

3 amps

b)

32 amps

c)

16 amps

d)

192 amps

15.

Using the magic triangle shown calculate the resistance in the circuit when the voltage = 48v and the current = 12 amps

a)

4 ohms

b)

60 ohms

c)

36 ohms

d)

10 ohms

16.

Which of the following is the correct SI unit for power?

a)

Ohm

b)

Volt

c)

Amp

d)

Watt

17.

Using the magic triangle shown calculate the power (watts) in the circuit when the current = 5 amps and the voltage = 12 volts

a)

60 watts

b)

17 watts

c)

7 watts

d)

55 watts

18.

Using the magic triangle shown calculate the current in the circuit when the voltage = 12 volts and the power (watts) = 100 watts

a)

8.33 amps

b)

112 amps

c)

88 amps

d)

26.22 amps

19.

Using the magic triangle shown calculate the voltage in the circuit when the current = 3 amps and the power (watts) = 72 watts

a)

24 volts

b)

12 volts

c)

48 volts

d)

75 volts

20.

A regular customer at the garage you work at has asked you to fit the spot lamps as shown. The vehicle is 12 volt and the bulbs are 100w. Calculate the total current flow in the circuit when both lamps are switched on.

a)

8.33 amps

b)

16.6 amps

c)

112 amps

d)

88 amps