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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 41 · 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 1.2 W device works on 12 V. What current does it take (in amperes)? =
  2. 2.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  3. 3.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = I ÷ V (c) P = V × I (d) P = V + I
  4. 4.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  5. 5.⚡ 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
  6. 6.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  7. 7.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  9. 9.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  11. 11.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  12. 12.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  13. 13.⚡ A device works on 9 V and takes 3 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 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  16. 16.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  17. 17.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  18. 18.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  19. 19.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  20. 20.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  21. 21.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  22. 22.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  23. 23.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  24. 24.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  25. 25.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  26. 26.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  27. 27.⚡ A 12 W device works on 12 V. What current does it take (in amperes)? =
  28. 28.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  32. 32.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  33. 33.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  35. 35.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  36. 36.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  39. 39.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  40. 40.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =

Answer key

  1. 0.1
  2. 0.1
  3. P = V × I
  4. 2
  5. energy used each second
  6. 3
  7. 0.2
  8. 920
  9. 36
  10. 0.3
  11. 18
  12. 1.5
  13. 27
  14. 345
  15. 0.25
  16. 1840
  17. 7.5
  18. 12
  19. 115
  20. 48
  21. 1.5
  22. 1150
  23. 0.9
  24. 0.5
  25. 9
  26. 0.1
  27. 1
  28. 0.1
  29. 1.8
  30. 12
  31. 0.5
  32. 2300
  33. 1.5
  34. 0.75
  35. 4.5
  36. 1.5
  37. 10
  38. 9
  39. 0.75
  40. 3

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