Ohm's Law Worksheet

Which of the following is NOT mentioned as a reason why Ohm’s law is relevant to plumbers?

• Fuse sizes

• MCB ratings

• Water pressure

• Cable sizes

Explain how Ohm’s law can assist a plumber in fault finding within a domestic heating system.

• By helping to identify incorrect fuse sizes

• By determining the best location for a radiator

• By calculating the amount of water needed

• By selecting the right paint color for pipes

If the power (P) is 3500W and the voltage (V) is 230V, what is the calculated current (I)?

• 10.2 amps

• 12.5 amps

• 15.2 amps

• 17.5 amps

What size MCB (Miniature Circuit Breaker) is recommended to protect the circuit for the immersion heater in the example?

• 10A

• 13A

• 16A

• 20A

According to Ohm’s law, what is the formula to calculate current (I) when power (P) and voltage (V) are known?

• I = P / V

• I = V / P

• I = P × V

• I = V - P

If a pump motor has a run current of 0.23A and is supplied with 230V, what is the resistance of the motor windings?

• 1000Ω

• 530Ω

• 53Ω

• 10Ω

What is the correct formula for electrical power (P) according to the power triangle?

• P = I x V

• P = V / I

• P = I / V

• P = V x R

Which of the following is a type of electrical circuit?

• Series

• Direct

• Alternating

• Rotational

If one bulb in a series circuit burns out, what happens to the rest of the bulbs?

• All bulbs go out.

• The rest of the bulbs stay lit.

• The brightness of the remaining bulbs increases.

• The circuit continues to work as normal.

Based on the diagram, what type of circuit is shown?

• Series circuit

• Parallel circuit

• Mixed circuit

• Open circuit