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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 256 · 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) the colour of light (b) the size of a cell (c) the length of a wire (d) energy used each second
  2. 2.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  3. 3.⚡ A device works on 24 V and takes 0.1 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 home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  6. 6.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  7. 7.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  8. 8.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  9. 9.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  11. 11.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  12. 12.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  14. 14.⚡ A device works on 12 V and takes 3 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 home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  17. 17.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  18. 18.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  19. 19.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  20. 20.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  21. 21.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  22. 22.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  26. 26.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  27. 27.⚡ A 48 W device works on 24 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 0.3 W device works on 3 V. What current does it take (in amperes)? =
  30. 30.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  31. 31.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
  32. 32.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  33. 33.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  34. 34.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  35. 35.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  38. 38.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  40. 40.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =

Answer key

  1. energy used each second
  2. 4.5
  3. 2.4
  4. P = V × I
  5. 230
  6. 345
  7. 1.2
  8. 18
  9. 18
  10. 2.25
  11. 1.5
  12. 0.1
  13. 460
  14. 36
  15. 4.8
  16. 920
  17. 0.5
  18. 0.2
  19. 0.1
  20. 13.5
  21. 0.25
  22. 1.5
  23. 1.25
  24. 9
  25. 72
  26. 0.3
  27. 2
  28. 0.6
  29. 0.1
  30. 1840
  31. 1
  32. 2300
  33. 115
  34. 24
  35. 0.2
  36. 15
  37. 3
  38. 0.25
  39. 18
  40. 1

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