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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 19 · 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 3 V and takes 1.5 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.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V × I (c) P = I ÷ V (d) P = V + I
  4. 4.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  5. 5.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  6. 6.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  7. 7.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  8. 8.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  9. 9.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  10. 10.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  11. 11.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  12. 12.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  13. 13.⚡ Power tells us … (a) the colour of light (b) the length of a wire (c) the size of a cell (d) energy used each second
  14. 14.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  15. 15.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  17. 17.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  18. 18.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  19. 19.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  20. 20.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  21. 21.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  22. 22.⚡ A home appliance on the 230 V mains takes 8 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 device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  25. 25.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  26. 26.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  27. 27.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  29. 29.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  30. 30.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  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 1 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 9 V and takes 2 A. What is its power (in watts)? =
  35. 35.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  36. 36.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  37. 37.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  38. 38.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  39. 39.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  40. 40.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =

Answer key

  1. 4.5
  2. 4.8
  3. P = V × I
  4. 0.6
  5. 0.5
  6. 2.25
  7. 920
  8. 72
  9. 5
  10. 0.2
  11. 6
  12. 115
  13. energy used each second
  14. 460
  15. 0.25
  16. 18
  17. 0.25
  18. 0.25
  19. 2300
  20. 36
  21. 10
  22. 1840
  23. 0.9
  24. 0.75
  25. 1150
  26. 2
  27. 3
  28. 1.2
  29. 0.2
  30. 1.5
  31. 0.5
  32. 230
  33. 3
  34. 18
  35. 1
  36. 24
  37. 0.5
  38. 0.1
  39. 345
  40. 2.25

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