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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 68 · 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.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V × I (c) P = V ÷ I (d) P = V + I
  2. 2.⚡ Power tells us … (a) the colour of light (b) the size of a cell (c) energy used each second (d) the length of a wire
  3. 3.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  4. 4.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  5. 5.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  6. 6.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  7. 7.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  9. 9.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  12. 12.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  14. 14.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  15. 15.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  17. 17.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  20. 20.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  22. 22.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  24. 24.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  25. 25.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  26. 26.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  27. 27.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  29. 29.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  30. 30.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  31. 31.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  32. 32.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  33. 33.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  35. 35.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  36. 36.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  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 5 V and takes 1.5 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =

Answer key

  1. P = V × I
  2. energy used each second
  3. 0.2
  4. 0.1
  5. 1
  6. 0.375
  7. 72
  8. 1840
  9. 1.5
  10. 0.9
  11. 1150
  12. 9
  13. 1.2
  14. 6
  15. 1
  16. 15
  17. 0.2
  18. 2.5
  19. 18
  20. 0.1
  21. 9
  22. 1
  23. 0.6
  24. 115
  25. 920
  26. 0.2
  27. 2
  28. 0.6
  29. 1.5
  30. 0.1
  31. 2300
  32. 0.5
  33. 2
  34. 9
  35. 4.5
  36. 0.75
  37. 3
  38. 230
  39. 7.5
  40. 1.25

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