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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 55 · 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.

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  1. 1.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  2. 2.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  3. 3.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = I ÷ V (d) P = V × I
  4. 4.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  5. 5.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  6. 6.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  7. 7.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  8. 8.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  9. 9.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  10. 10.⚡ Power tells us … (a) the colour of light (b) energy used each second (c) the size of a cell (d) the length of a wire
  11. 11.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  12. 12.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  13. 13.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  14. 14.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  15. 15.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  16. 16.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  17. 17.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  19. 19.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  20. 20.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  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 9 V and takes 1 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 5 V and takes 0.2 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 0.3 W device works on 3 V. What current does it take (in amperes)? =
  28. 28.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  30. 30.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  31. 31.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  32. 32.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  33. 33.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  34. 34.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  35. 35.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  36. 36.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  37. 37.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  38. 38.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  39. 39.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =

Answer key

  1. 5
  2. 36
  3. P = V × I
  4. 0.15
  5. 1840
  6. 0.5
  7. 2300
  8. 920
  9. 0.2
  10. energy used each second
  11. 3
  12. 1.5
  13. 1.5
  14. 0.75
  15. 13.5
  16. 2.25
  17. 0.5
  18. 18
  19. 115
  20. 345
  21. 460
  22. 9
  23. 4.5
  24. 0.9
  25. 1
  26. 1.5
  27. 0.1
  28. 3
  29. 10
  30. 2
  31. 1150
  32. 48
  33. 230
  34. 1.8
  35. 3
  36. 0.1
  37. 0.1
  38. 18
  39. 0.2
  40. 1.2

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