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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 57 · 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 0.25 A. What is its power (in watts)? =
  2. 2.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  3. 3.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  4. 4.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
  5. 5.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  6. 6.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  7. 7.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  8. 8.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  9. 9.⚡ Which formula gives electric power? (a) P = V + I (b) P = V × I (c) P = V ÷ I (d) P = I ÷ V
  10. 10.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  11. 11.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  12. 12.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  13. 13.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  14. 14.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  15. 15.⚡ Power tells us … (a) the length of a wire (b) the size of a cell (c) energy used each second (d) the colour of light
  16. 16.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  17. 17.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  18. 18.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  19. 19.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  20. 20.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  21. 21.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  22. 22.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  23. 23.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  24. 24.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  25. 25.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  26. 26.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  27. 27.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  29. 29.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  30. 30.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  31. 31.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  32. 32.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  33. 33.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  35. 35.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  36. 36.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  38. 38.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  39. 39.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  40. 40.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =

Answer key

  1. 1.25
  2. 4.8
  3. 12
  4. 2
  5. 27
  6. 3
  7. 2.5
  8. 2.4
  9. P = V × I
  10. 2300
  11. 0.1
  12. 1.5
  13. 4.5
  14. 0.5
  15. energy used each second
  16. 0.25
  17. 2
  18. 345
  19. 1.5
  20. 115
  21. 3
  22. 0.3
  23. 0.2
  24. 0.2
  25. 13.5
  26. 2
  27. 48
  28. 6
  29. 460
  30. 5
  31. 0.2
  32. 1150
  33. 1.5
  34. 4.5
  35. 7.5
  36. 0.5
  37. 0.5
  38. 0.1
  39. 920
  40. 24

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