10.3 Power

Is the amount of energy being transferred over a period of time.

• Power
• Energy
• Seconds
• Joules

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What is the unit of measurement for power?

• Joules
• Watts
• Voltage
• Calories

How much energy does this appliance transfer per second?

• 240 V
• 50 Hz
• 150 W
• N533

A microwave has a power rating of 1550 W. How much energy does it transfer per second?

• 1.550 Joules
• 15.50 Joules
• 155.0 Joules
• 1550 Joules

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Which type of appliances transfer the most energy per second?

• Those that transfer energy into heat.
• Those that transfer energy into light.
• Those that transfer energy into sound.
• Those that transfer energy into movement.

Which appliance transfers the most energy per second? 

• Clock
• Lamp
• Desktop Computer
• Iron

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

• 2000 Watts
• 1000 Watts
• 500 Watts
• cannot be determined

How much power is generated by Ashley (50 kg) running up a 6 m flight of stairs in 5 seconds?

• 60 W

• 62 W

• 600 W

• 1500 W

Jack pushes a lawnmower with a force of 25N and performs 250 J of work. How far did he push the mower?

• 1 meter
• 1 kilometer
• 10 meters
• none of these

A 200 W conveyor is used to raise boxes of cupcakes up a 10 meter building. If it takes 10 seconds to move a cake, how much do the boxes weigh?

• 20 N
• 200 N
• 2,000 N
• 2 N

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