Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 829 · 40 questions

Remember (Push times flow): P = V × I (watts = volts × amperes). I = P ÷ V; V = P ÷ I. Example: 230 V × 2 A = 460 W; 6 W ÷ 12 V = 0.5 A.

1. 1.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
2. 2.⚡ Which formula gives electric power? (a) P = V × I (b) P = V ÷ I (c) P = I ÷ V (d) P = V + I
3. 3.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
4. 4.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
5. 5.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
6. 6.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
7. 7.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
8. 8.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
9. 9.⚡ Power tells us … (a) the size of a cell (b) energy used each second (c) the colour of light (d) the length of a wire
10. 10.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
11. 11.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
12. 12.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
13. 13.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
14. 14.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
15. 15.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
16. 16.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
17. 17.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
18. 18.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
19. 19.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
20. 20.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
21. 21.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
22. 22.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
23. 23.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
24. 24.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
25. 25.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
26. 26.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
27. 27.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
28. 28.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
29. 29.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
30. 30.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
31. 31.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
32. 32.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
33. 33.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
34. 34.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
35. 35.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
36. 36.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
37. 37.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
38. 38.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
39. 39.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
40. 40.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =

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