Power calculations

Stage 1

1. Find the power of a toaster that uses 127270 J in 110 s.

2. Find the power of a washing machine that in 141 s uses 71769 J.

3. Find the power of a kettle that in 212 s uses 390292 J.

4. Find the power of a light bulb that in 187 s uses 11407 J.

5. Find the power of a fan that uses 14941 J in 223 s.

Stage 2

6. Find the time taken for a 62 W electric fan to use 5456 J of energy.

7. Find the time taken for a 2515 W kettle to use 279165 J of energy.

8. Find the energy used by a 31 W light bulb which is on for 172 s.

9. Find the energy used by a 85 W electric fan which is on for 202 s.

10. Find the energy used by a 549 W washing machine in 278 s.

Stage 3

11. Find the energy used by a 0.056 kW electric fan which is on for 2 minutes 33 seconds.

12. Find the time taken for a 0.499 kW washing machine to use 118762 J of energy.

13. Find the time taken for a 0.08 kW electric fan to use 10880 J of energy.

14. Find the power of a fan that uses 9.588 kJ in 1 minute 42 seconds.

15. Find the energy used by a 0.456 kW washing machine in 1 minute 50 seconds.

Stage 1

1. 1157 W

2. 509 W

3. 1841 W

4. 61 W

5. 67 W

Stage 2

6. 88 s

7. 111 s

8. 5332 J

9. 17170 J

10. 152622 J

Stage 3

11. 8568 J

12. 238 s

13. 136 s

14. 94 W

15. 50160 J