Electricity and Energy Quiz

A 100 W fan operates for 3 hours. How much energy does it consume in kWh?

• 0.2 kWh

• 0.3 kWh

• 0.5 kWh

• 0.8 kWh

An electric heater draws 10 A from a 230 V source. What is its power rating?

• 2.3 W

• 23 W

• 2300 W

• 23000 W

The energy used by a 60 W bulb in 2 minutes is:

• 7.2 kJ

• 120 J

• 7200 J

• 0.12 J

Power is the rate of:

• Heat loss

• Energy transfer

• Resistance flow

• Voltage fluctuation

What is the current through a 100 W bulb connected to 250 V supply?

• 0.4 A

• 2.5 A

• 1.2 A

• 0.25 A

If an appliance uses 1500 J in 10 seconds, calculate the power.

• 150 W

• 1500 W

• 15 W

• 100 W

A 2 kW geyser is used for 15 minutes. What energy is consumed in kWh?

• 0.5 kWh

• 2.0 kWh

• 0.25 kWh

• 1.0 kWh

Power =

• Current × Resistance

• Voltage / Current

• Current × Voltage

• Resistance × Voltage

A wire has resistance 10 Ω and current 2 A. What is the voltage?

• 5 V

• 10 V

• 15 V

• 20 V

Voltage is 12 V, resistance is 3 Ω. What is the current?

• 4 A

• 36 A

• 9 A

• 6 A