Define electrical power and state its SI unit.

Write down the formula that relates power (P), voltage (V), and current (I).

An electric kettle operating on a 230 V supply draws a current of 4 A. Calculate its power.

Write the formula for calculating the electrical energy (E) consumed by an appliance.

Calculate the energy in Joules consumed by a 100 W light bulb that is switched on for 5 minutes.

What is the commercial unit used to measure electrical energy consumption for household billing?

How many Joules are equivalent to one kilowatt-hour (kWh)?

Name the two main cables that deliver electricity from the national grid to a house.

What is the main function of the Residual Current Circuit Breaker (RCCB) or trip switch in a domestic circuit?

Differentiate between the purpose of a 6 A MCB and a 13 A MCB in a distribution box.

Why are switches and fuses always connected to the live wire and not the neutral wire?

Explain why it is more energy-efficient to use an LED bulb compared to a traditional filament bulb for the same brightness.

What is the purpose of the earth wire in a three-pin plug?

A household uses a 1500 W heater for 2 hours. How many kWh of energy has it consumed?

List three important safety precautions to follow when using electricity at home.