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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 257 · 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) energy used each second (b) the size of a cell (c) the colour of light (d) the length of a wire
  2. 2.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  3. 3.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  4. 4.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V × I (c) P = V + I (d) P = V ÷ I
  5. 5.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  6. 6.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  7. 7.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  8. 8.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  9. 9.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  10. 10.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  11. 11.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  12. 12.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  13. 13.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  15. 15.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  16. 16.⚡ A device works on 9 V and takes 1 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 device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  20. 20.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  21. 21.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  23. 23.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  24. 24.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  25. 25.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  29. 29.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  31. 31.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  32. 32.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  33. 33.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 12 V and takes 0.2 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 1 W device works on 5 V. What current does it take (in amperes)? =
  37. 37.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  38. 38.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  39. 39.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  40. 40.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =

Answer key

  1. energy used each second
  2. 6
  3. 2300
  4. P = V × I
  5. 0.2
  6. 1.5
  7. 2
  8. 0.1
  9. 920
  10. 345
  11. 1.5
  12. 460
  13. 2.25
  14. 115
  15. 0.6
  16. 9
  17. 18
  18. 1.2
  19. 1.5
  20. 7.5
  21. 24
  22. 18
  23. 0.2
  24. 9
  25. 1.5
  26. 10
  27. 2.25
  28. 36
  29. 1.5
  30. 12
  31. 0.25
  32. 2
  33. 0.2
  34. 2.4
  35. 1
  36. 0.2
  37. 2
  38. 230
  39. 0.75
  40. 0.25

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