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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 49 · 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 1.5 V and takes 0.2 A. What is its power (in watts)? =
  2. 2.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  3. 3.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  4. 4.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  5. 5.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V + I (c) P = V ÷ I (d) P = V × I
  6. 6.⚡ 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
  7. 7.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  8. 8.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  9. 9.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  12. 12.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  14. 14.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  15. 15.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  16. 16.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
  17. 17.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  20. 20.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  21. 21.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  22. 22.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  23. 23.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  24. 24.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  25. 25.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  26. 26.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  27. 27.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  30. 30.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  31. 31.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  32. 32.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  34. 34.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  35. 35.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  36. 36.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  38. 38.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  40. 40.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =

Answer key

  1. 0.3
  2. 0.5
  3. 24
  4. 0.1
  5. P = V × I
  6. energy used each second
  7. 1
  8. 0.25
  9. 1.5
  10. 3
  11. 115
  12. 0.2
  13. 920
  14. 36
  15. 345
  16. 2
  17. 0.1
  18. 27
  19. 4.8
  20. 3
  21. 72
  22. 2300
  23. 0.2
  24. 1840
  25. 230
  26. 460
  27. 7.5
  28. 12
  29. 0.75
  30. 1150
  31. 0.15
  32. 1
  33. 12
  34. 0.9
  35. 1.5
  36. 1
  37. 0.6
  38. 3
  39. 0.6
  40. 0.1

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