Chapter 8 · ICSE Class 8 Physics (Selina Concise)

Household Electricity

Learn how electricity is safely distributed and used in homes, including fuses and safety precautions.

🔌 Chapter 8

A fuse protecting a household circuit from overload A fuse connected in a household circuit between the power supply and an appliance, which melts and breaks the circuit if too much current flows, preventing damage or fire Supply Fuse Appliance Fuse melts & breaks circuit if current is too high
8.1

Household Electrical Circuits

Household circuits distribute electricity to appliances through live, neutral, and earth wires, ensuring safe operation.

1

What is the purpose of the earth wire in household wiring?

It provides a safe path for excess current to flow into the ground, protecting people from electric shocks

2

Why are appliances connected in parallel rather than in series in homes?

So each appliance can operate independently, and if one fails, others still work

8.2

Fuses and Electrical Safety

A fuse is a safety device that melts and breaks the circuit if current exceeds a safe level, preventing fires and damage.

1

What happens when too much current flows through a circuit with a fuse?

The fuse wire melts and breaks the circuit, stopping the current flow and preventing damage or fire

2

Why should you never touch electrical switches with wet hands?

Water conducts electricity, increasing the risk of a dangerous electric shock

Practice

Exercises

1. What is the purpose of an earth wire?

2. What is a fuse?

3. Why are home appliances connected in parallel?

4. Why is it dangerous to touch switches with wet hands?

5. Name the three types of wires typically found in household wiring.