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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 30 · 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 6 W device works on 12 V. What current does it take (in amperes)? =
  2. 2.⚡ Power tells us … (a) energy used each second (b) the colour of light (c) the length of a wire (d) the size of a cell
  3. 3.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  4. 4.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  5. 5.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  6. 6.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  7. 7.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V + I (c) P = V × I (d) P = I ÷ V
  8. 8.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  9. 9.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  10. 10.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  11. 11.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  12. 12.⚡ A 36 W device works on 12 V. What current does it take (in amperes)? =
  13. 13.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  14. 14.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  15. 15.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  17. 17.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  18. 18.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  19. 19.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  20. 20.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  21. 21.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  22. 22.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  23. 23.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  24. 24.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  25. 25.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  26. 26.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  27. 27.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  28. 28.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  30. 30.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  31. 31.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  32. 32.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  33. 33.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  35. 35.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  36. 36.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  37. 37.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  38. 38.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  39. 39.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =

Answer key

  1. 0.5
  2. energy used each second
  3. 1
  4. 1.5
  5. 0.2
  6. 1.5
  7. P = V × I
  8. 0.1
  9. 24
  10. 1.5
  11. 4.5
  12. 3
  13. 3
  14. 3
  15. 0.5
  16. 0.3
  17. 345
  18. 230
  19. 3
  20. 4.8
  21. 13.5
  22. 2
  23. 460
  24. 920
  25. 0.2
  26. 1150
  27. 5
  28. 0.25
  29. 6
  30. 1.5
  31. 3
  32. 1840
  33. 3
  34. 7.5
  35. 0.5
  36. 2300
  37. 0.25
  38. 2.4
  39. 0.25
  40. 1.8

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