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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 62 · 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.⚡ Power tells us … (a) the colour of light (b) the size of a cell (c) the length of a wire (d) energy used each second
  2. 2.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  3. 3.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  4. 4.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  5. 5.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  6. 6.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
  7. 7.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  8. 8.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  9. 9.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V + I (d) P = V × I
  10. 10.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  11. 11.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  12. 12.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  13. 13.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  14. 14.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  15. 15.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  16. 16.⚡ A 48 W device works on 24 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  18. 18.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  20. 20.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  21. 21.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  22. 22.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  23. 23.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  24. 24.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  25. 25.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 1.5 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 1.8 W device works on 9 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  30. 30.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  31. 31.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  32. 32.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  34. 34.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  35. 35.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  36. 36.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  38. 38.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  40. 40.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =

Answer key

  1. energy used each second
  2. 0.6
  3. 2
  4. 1
  5. 1150
  6. 1.5
  7. 0.375
  8. 0.25
  9. P = V × I
  10. 115
  11. 230
  12. 2300
  13. 9
  14. 4.5
  15. 0.2
  16. 2
  17. 7.5
  18. 0.25
  19. 72
  20. 0.2
  21. 460
  22. 4.5
  23. 920
  24. 0.3
  25. 0.5
  26. 0.75
  27. 2.4
  28. 0.2
  29. 24
  30. 3
  31. 0.25
  32. 0.1
  33. 1.8
  34. 3
  35. 0.1
  36. 0.5
  37. 9
  38. 1
  39. 2.25
  40. 2

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