1. A student makes a statement:

‘The power of a light bulb is 60 W.’

What does this statement mean, in terms of energy?

 

2. Copy and complete this table:

 

 

 

 

 

 

3. What is the power of a radio that uses up 27 kJ of electrical energy in five minutes?

4. How much electrical energy is used up by a 725 W fridge in one day?

5. How long will it take a 1.2 kW vacuum cleaner to use up 720 kJ of electrical energy?

6. A 42 inch LED television has a power rating of 52 W when it is fully operational. When it is on standby, the television has a power rating of 0.8 W.

(a) How much electrical energy will the television use if it is fully operational for 4 hours?

(b) How much electrical energy will the television use if it is on standby for 10 hours?

(c) Will the television use up more electrical energy being on standby for two days or being fully operational for 45 minutes?

7. The power consumption of three game consoles is given in the table.

(a) How much electrical energy will a Playstation 3 use up in 60 minutes?

(b) How long, in hours, will it take an X Box 360 to use up 792 kJ of electrical energy?

(c) How much less energy does a Nintendo Wii use if it is played for half an hour, compared to an X Box 360?