Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 509 · 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.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V × I (d) P = V + I
2. 2.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
3. 3.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
4. 4.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
5. 5.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
6. 6.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
7. 7.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
8. 8.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
9. 9.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
10. 10.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
11. 11.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
12. 12.⚡ Power tells us … (a) the size of a cell (b) the colour of light (c) energy used each second (d) the length of a wire
13. 13.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
14. 14.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
15. 15.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
16. 16.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
17. 17.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
18. 18.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
19. 19.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
20. 20.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
21. 21.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
22. 22.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
23. 23.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
24. 24.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
25. 25.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
26. 26.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
27. 27.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
28. 28.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
29. 29.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
30. 30.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
31. 31.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
32. 32.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
33. 33.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
34. 34.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
35. 35.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
36. 36.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
37. 37.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
38. 38.⚡ A 4.5 W device works on 1.5 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 3 V and takes 0.25 A. What is its power (in watts)? =

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