Electricity - Calculating electrical consumption

Calculate the power of bulb X.

• 2 W

• 6 W

• 8 W

• 12 W

Calculate the electrical energy used by bulb X in 2 minutes.

• 12 J

• 24 J

• 1440 J

• 720 J

A toaster, rated 1500 W 240 V, is switched on for 15 minutes. Calculate the energy used.

• 3600 J

• 22 500 J

• 216 000 J

• 1 350 000 J

Tags

NGSS.HS-PS3-1

An air-con, rated 1.8 kW 240 V, is switched on for 10 minutes. Calculate the energy used.

• 1 080 000 J

• 144 000 J

• 2400 J

• 18 J

Tags

NGSS.HS-PS3-1

A fan, rated 50 W 240 V, uses 90 000 J of electrical energy. How long was the fan switched on?

Hint: Find the time.

• 1800 h

• 1800 s

• 375 s

• 375 h

Calculate the power of the light bulb P.

Calculate the power of the light bulb Q.

A 0.40 kW lamp was turned on for 8 hours.

What is the electrical energy in kWh consumed by the lamp?

A 1.2 kW microwave oven was used for 2 hours.

What is the electrical energy in kWh consumed by the oven?

A 1200 W iron was switched on for 3 hours.

Calculate the electrical energy consumed by the iron in kWh.