Power calculations

Stage 1

1. Find the power of a fan that in 106 s uses 7738 J.

2. Find the power of a kettle that in 191 s uses 353159 J.

3. Find the power of a light bulb that in 64 s uses 4032 J.

4. Find the power of a toaster that uses 120205 J in 145 s.

5. Find the power of a washing machine that uses 174960 J in 270 s.

Stage 2

6. Find the energy used by a 45 W light bulb which is on for 123 s.

7. Find the energy used by a 1434 W toaster in 235 s.

8. Find the time taken for a 64 W light bulb to use 6400 J of energy.

9. Find the time taken for a 458 W washing machine to use 88852 J of energy.

10. Find the energy used by a 1821 W kettle in 102 s.

Stage 3

11. Find the time taken for a 1.14 kW toaster to use 159600 J of energy.

12. Find the energy used by a 0.537 kW washing machine in 4 minutes 35 seconds.

13. Find the energy used by a 0.912 kW toaster in 81 s.

14. Find the power of a light bulb that in 2 minutes 15 seconds uses 6.615 kJ .

15. Find the time taken for a 0.094 kW light bulb to use 8.084 kJ of energy.

Stage 1

1. 73 W

2. 1849 W

3. 63 W

4. 829 W

5. 648 W

Stage 2

6. 5535 J

7. 336990 J

8. 100 s

9. 194 s

10. 185742 J

Stage 3

11. 140 s

12. 147675 J

13. 73872 J

14. 49 W

15. 86 s