# Power calculations

## Stage 1

1. Find the power of a light bulb that in 154 s uses 15246 J.

2. Find the power of a toaster that uses 190470 J in 210 s.

3. Find the power of a fan that in 169 s uses 10140 J.

4. Find the power of a washing machine that in 169 s uses 101400 J.

5. Find the power of a kettle that uses 532716 J in 206 s.

## Stage 2

6. Find the energy used by a 62 W light bulb which is on for 172 s.

7. Find the energy used by a 2330 W kettle in 141 s.

8. Find the energy used by a 569 W washing machine in 131 s.

9. Find the time taken for a 84 W electric fan to use 11676 J of energy.

10. Find the time taken for a 1711 W kettle to use 497901 J of energy.

## Stage 3

11. Find the energy used by a 0.068 kW electric fan which is on for 114 s.

12. Find the power of a toaster that in 183 s uses 148.23 kJ .

13. Find the time taken for a 76 W electric fan to use 19.76 kJ of energy.

14. Find the time taken for a 0.053 kW electric fan to use 14.045 kJ of energy.

15. Find the energy used by a 0.051 kW electric fan which is on for 3 minutes 26 seconds.

1. 99 W

2. 907 W

3. 60 W

4. 600 W

5. 2586 W

6. 10664 J

7. 328530 J

8. 74539 J

9. 139 s

10. 291 s

11. 7752 J

12. 810 W

13. 260 s

14. 265 s

15. 10506 J