Power Calculations

How many kilowatt-hours are used by a 400 W fan running for 12 hours?

• 4.8 kWh

• 48 kWh

• 480 kWh

• 0.48 kWh

Tags

NGSS.HS-PS3-1

A dishwasher uses 1800 W of power and operates for 1.5 hours. How many kilowatt-hours of energy does it consume?

• 2.7 kWh

• 27 kWh

• 270 kWh

• 0.27 kWh

Tags

NGSS.HS-PS3-1

If a space heater uses 1500 W and runs for 6 hours, how many kilowatt-hours of energy are used?

• 9 kWh

• 90 kWh

• 900 kWh

• 0.9 kWh

Tags

NGSS.HS-PS3-1

Calculate the energy consumption in kilowatt-hours for a device that uses 200 W for 15 hours.

• 3 kWh

• 30 kWh

• 300 kWh

• 0.3 kWh

Tags

NGSS.HS-PS3-1

A vacuum cleaner uses 1600 W of power. If it runs for 0.75 hours, how many kilowatt-hours of energy does it consume?

• 1.2 kWh

• 12 kWh

• 120 kWh

• 0.12 kWh

Tags

NGSS.HS-PS3-1

If a computer uses 300 W of power and operates for 10 hours, how many kilowatt-hours of energy does it consume?

• 3 kWh

• 30 kWh

• 300 kWh

• 0.3 kWh

Tags

NGSS.HS-PS3-1

The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?

• 170 W

• 170 A

• 1.7 V

• 1.7 W

A kettle transfers 1000J of energy every 2 seconds. Calculate its power.

• 2000 Watts

• 1000 Watts

• 500 Watts

• cannot be determined

A microwave used 75 kJ of energy to heat up a lasagna. If the microwave was 750 W how long did this take?

• 10 minutes

• 100 seconds

• 5000 hours

• i don't eat lasagna I'm not Garfield

Tags

NGSS.HS-PS3-1

A lamp has a 120 W power rating. It is left on for 30 seconds. How much energy did it use?

• 3600 J

• 36 J

• 450 J

• nah

Tags

NGSS.HS-PS3-1