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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 504 · 40 questions
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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.

NameDateTime takenScore ___ / 40
  1. 1.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  2. 2.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  3. 3.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  4. 4.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  5. 5.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  7. 7.⚡ Power tells us … (a) the colour of light (b) the length of a wire (c) the size of a cell (d) energy used each second
  8. 8.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  9. 9.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  10. 10.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  11. 11.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  12. 12.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V × I (c) P = V + I (d) P = V ÷ I
  13. 13.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  14. 14.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  15. 15.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  16. 16.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  18. 18.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  19. 19.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  20. 20.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  21. 21.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  23. 23.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  24. 24.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  25. 25.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  30. 30.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  31. 31.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  34. 34.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  35. 35.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  36. 36.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  39. 39.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =

Answer key

  1. 24
  2. 0.9
  3. 9
  4. 460
  5. 2.5
  6. 920
  7. energy used each second
  8. 2.4
  9. 2.25
  10. 0.2
  11. 0.25
  12. P = V × I
  13. 345
  14. 230
  15. 24
  16. 3
  17. 12
  18. 3
  19. 0.2
  20. 0.75
  21. 0.6
  22. 6
  23. 0.1
  24. 1
  25. 0.25
  26. 3
  27. 2.4
  28. 18
  29. 9
  30. 115
  31. 4.8
  32. 0.6
  33. 3
  34. 0.15
  35. 1.5
  36. 0.1
  37. 72
  38. 36
  39. 10
  40. 13.5

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