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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 75 · 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 length of a wire (b) the colour of light (c) the size of a cell (d) energy used each second
  2. 2.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
  3. 3.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  4. 4.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  5. 5.⚡ A 3 W device works on 12 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 home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  8. 8.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  9. 9.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  10. 10.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  11. 11.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = V × I (d) P = I ÷ V
  12. 12.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 10 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 5 W device works on 5 V. What current does it take (in amperes)? =
  16. 16.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  17. 17.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  18. 18.⚡ A 36 W device works on 12 V. What current does it take (in amperes)? =
  19. 19.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  20. 20.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  21. 21.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  22. 22.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  26. 26.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  27. 27.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  28. 28.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  33. 33.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  35. 35.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  36. 36.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  39. 39.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  40. 40.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =

Answer key

  1. energy used each second
  2. 1.5
  3. 1840
  4. 2.5
  5. 0.25
  6. 345
  7. 460
  8. 0.6
  9. 0.25
  10. 1
  11. P = V × I
  12. 3
  13. 2300
  14. 230
  15. 1
  16. 115
  17. 0.1
  18. 3
  19. 1.5
  20. 9
  21. 2
  22. 3
  23. 2.4
  24. 0.3
  25. 0.15
  26. 0.5
  27. 1150
  28. 13.5
  29. 12
  30. 4.5
  31. 1.25
  32. 1.2
  33. 0.25
  34. 15
  35. 920
  36. 3
  37. 9
  38. 0.3
  39. 2
  40. 0.5

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