Y9 Power equation: P = E/t

Convert 900W into kW

• 0.9

• 90

• 0.09

• 9

Convert 12.4MW to W

• 12.4 W

• 12,400 W

• 12,400,000 W

• 12,400,00 W

How much energy does a pair of 800W hair straighteners transfer every second?

• 80

• 0.8

• 800

• 8

1500J of energy are used every second by a microwave oven, what is the power rating of the oven?

• 1.5 kW

• 15 kW

• 15 W

• 1.5 MW

8,000J of energy are used by a blender in 80 seconds. What is the power rating on the blender?

• 640000 W

• 100 W

• 0.01 W

• 64 kW

Spiderman’s nemesis Electro delivers 4000J of electrical energy in half a second. How powerful is he?

• 2000 W

• 20 kW

• 80 kW

• 8000 W

A 2.0 W iPad is used for 300 seconds. How much energy does it use?

• 6 J

• 600 J

• 6000 J

• 60 J

A Tesla Roadster electric car is rated at 16800 W. How much energy does it use during a one minute drive?

• 1008000 J

• 108 J

• 1080000 J

• 108000 J