Puzzles on numericals on Electricity

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Class 8 Electricity Puzzles

Class 8 Electricity Puzzles

1. Electric Energy: A 100 W bulb is used for 5 hours. How much energy is consumed in kWh?

Hint: Energy = Power × Time

Answer: 0.5 kWh

2. Safe Current: A fuse allows a safe current of 10 A. What happens if 15 A flows through it?

Hint: A fuse breaks when the current exceeds the safe limit.

Answer: The fuse will blow to protect the circuit.

3. Power: An appliance uses 220 V and draws 2 A. Calculate the power it uses.

Hint: Power = Voltage × Current

Answer: 440 W

4. Safe Current: A wire can carry a maximum of 8 A. What will happen if 12 A flows through it?

Hint: Exceeding the safe current can cause overheating.

Answer: The wire may overheat and cause a fire hazard.

5. Electric Energy: A TV of 150 W is used for 3 hours daily. How much energy does it consume in one week?

Hint: Total Energy = Power × Time × Days

Answer: 3.15 kWh

6. Power: A light bulb operates on 240 V and uses 0.5 A. What is its power?

Hint: Power = Voltage × Current

Answer: 120 W

7. Safe Current: What is the safe current rating for a 5 A fuse in a circuit?

Hint: The safe current rating is the value marked on the fuse.

Answer: 5 A

8. Electric Energy: How much energy is consumed if a 500 W heater runs for 4 hours?

Hint: Energy = Power × Time

Answer: 2 kWh

9. Power: A fan uses 110 V and draws 1.5 A. What is its power?

Hint: Power = Voltage × Current

Answer: 165 W

10. Safe Current: Why is it important to use a fuse of the correct current rating?

Hint: A fuse protects the circuit from excessive current.

Answer: Using the correct rating prevents damage to the circuit or appliances.

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