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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 25 · 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 3 W device works on 3 V. What current does it take (in amperes)? =
  2. 2.⚡ Power tells us … (a) the size of a cell (b) the colour of light (c) energy used each second (d) the length of a wire
  3. 3.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  4. 4.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  5. 5.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  7. 7.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V × I (c) P = I ÷ V (d) P = V + I
  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 6 V and takes 3 A. What is its power (in watts)? =
  10. 10.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  11. 11.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  12. 12.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  13. 13.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  14. 14.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  15. 15.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  16. 16.⚡ A home appliance on the 230 V mains takes 0.5 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 1.2 W device works on 6 V. What current does it take (in amperes)? =
  19. 19.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  20. 20.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  21. 21.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  22. 22.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  23. 23.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  24. 24.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  25. 25.⚡ A home appliance on the 230 V mains takes 10 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 12 W device works on 6 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  30. 30.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  31. 31.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  34. 34.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  35. 35.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  36. 36.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  37. 37.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  38. 38.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  39. 39.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =

Answer key

  1. 1
  2. energy used each second
  3. 0.6
  4. 0.1
  5. 2.4
  6. 1150
  7. P = V × I
  8. 920
  9. 18
  10. 0.5
  11. 2
  12. 230
  13. 0.75
  14. 1.5
  15. 1.25
  16. 115
  17. 0.5
  18. 0.2
  19. 0.2
  20. 1840
  21. 2
  22. 2.25
  23. 0.25
  24. 0.5
  25. 2300
  26. 0.3
  27. 2
  28. 1.8
  29. 1.2
  30. 460
  31. 1.5
  32. 3
  33. 0.3
  34. 6
  35. 4.5
  36. 345
  37. 6
  38. 1
  39. 1.5
  40. 0.75

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