Power - EDS

Energy transferred is measured using the unit

• calories

• Newtons

• Joules

The symbol for the unit Joules is

• Jo

• kJ

• J

• JLS

How many Joules in 1kJ

• 1,000

• 10

• 100

• 0.1

Power means

• how much energy something uses

• how much energy something transfers each second

• how loud a machine is

• how much force you can use to move something

To work out a machine's power you need to

• divide energy in Joules by time in seconds

• divide force by work done

• multiply energy in Joules by time in seconds

The unit for power is

• Newtons

• Joules

• Watts

If something has a power of 2kW it

• transfers 2W of energy every second

• transfers 2,000J of energy per second

• transfers 2,000W of energy every second

A laptop uses 500J of energy every 10 seconds. What is its power?

• 5,000W

• 500W

• 50W

• 0.5W