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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 527 · 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 = V ÷ I (b) P = I ÷ V (c) P = V × I (d) P = V + I
  2. 2.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  3. 3.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  4. 4.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  5. 5.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  6. 6.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  7. 7.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  8. 8.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  9. 9.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  10. 10.⚡ Power tells us … (a) the size of a cell (b) energy used each second (c) the colour of light (d) the length of a wire
  11. 11.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  12. 12.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  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 1.5 A. What is its power (in watts)?
  15. 15.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  16. 16.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  17. 17.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  18. 18.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  19. 19.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  20. 20.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  22. 22.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  23. 23.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  24. 24.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  25. 25.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  26. 26.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  27. 27.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  29. 29.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  34. 34.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  35. 35.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  36. 36.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  38. 38.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  40. 40.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =

Answer key

  1. P = V × I
  2. 1.8
  3. 920
  4. 24
  5. 460
  6. 230
  7. 0.3
  8. 12
  9. 0.5
  10. energy used each second
  11. 1150
  12. 115
  13. 2300
  14. 345
  15. 4.8
  16. 0.9
  17. 1840
  18. 3
  19. 2
  20. 0.2
  21. 4.5
  22. 0.1
  23. 1
  24. 3
  25. 0.25
  26. 3
  27. 1.5
  28. 9
  29. 3
  30. 0.375
  31. 9
  32. 2.4
  33. 7.5
  34. 0.2
  35. 6
  36. 0.1
  37. 15
  38. 0.1
  39. 6
  40. 1.5

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