Electricity in the Home

Question 1

Why are domestic appliances connected in parallel?

Answer 1

So each appliance gets full voltage from the supply.

Allows appliances to work independently—one can be turned off without affecting others.

Ensures equal voltage but different current as needed.

Question 2

What is the purpose of a fuse, circuit breaker, and earth wire?

Answer 2

Fuse: Melts and breaks the circuit if current is too high—prevents fire or damage.

Circuit Breaker: Automatically switches off the circuit during a fault—reusable safety device.

Earth Wire: Directs stray current safely into the ground if the appliance casing becomes live—prevents electric shock.
📌 Note: Fuses are always placed in the live wire.

Question 3

How do you choose the right fuse or circuit breaker for an appliance?

Answer 3

Select a fuse with a current rating just above the appliance’s normal operating current.
🔹 Example: For a device drawing 3A, use a 5A fuse.

Question 4

What are the risks of using appliances with incorrect or fluctuating voltages?

Answer 4

Overvoltage: Can damage circuits or cause overheating and fire.

Undervoltage: Causes malfunction, poor performance, or failure to operate.

Fluctuations: Lead to wear and tear on motors and electronics over time.