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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 21 · 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.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V + I (d) P = V × I
  2. 2.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  3. 3.⚡ Power tells us … (a) the colour of light (b) the length of a wire (c) energy used each second (d) the size of a cell
  4. 4.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  5. 5.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  6. 6.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  7. 7.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  8. 8.⚡ A 27 W device works on 9 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.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  11. 11.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  13. 13.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  15. 15.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  16. 16.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  17. 17.⚡ A 12 W device works on 12 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  19. 19.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  20. 20.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  21. 21.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  22. 22.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  25. 25.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  26. 26.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  27. 27.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  30. 30.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  31. 31.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 1.5 V and takes 0.2 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 7.5 W device works on 5 V. What current does it take (in amperes)? =
  35. 35.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  36. 36.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
  37. 37.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  38. 38.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  39. 39.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  40. 40.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =

Answer key

  1. P = V × I
  2. 0.2
  3. energy used each second
  4. 4.5
  5. 115
  6. 0.2
  7. 1150
  8. 3
  9. 24
  10. 1
  11. 0.25
  12. 1.5
  13. 0.25
  14. 460
  15. 1
  16. 0.1
  17. 1
  18. 18
  19. 1840
  20. 9
  21. 1
  22. 1.25
  23. 36
  24. 1.8
  25. 2300
  26. 1
  27. 0.25
  28. 2.25
  29. 0.6
  30. 0.1
  31. 1
  32. 0.3
  33. 1.5
  34. 1.5
  35. 4.8
  36. 2
  37. 920
  38. 230
  39. 1.5
  40. 0.25

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