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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 248 · 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 = V + I (b) P = I ÷ V (c) P = V ÷ I (d) P = V × I
  2. 2.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  3. 3.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  4. 4.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  5. 5.⚡ Power tells us … (a) the colour of light (b) the size of a cell (c) energy used each second (d) the length of a wire
  6. 6.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  7. 7.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  9. 9.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  10. 10.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  11. 11.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  13. 13.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  15. 15.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  16. 16.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  18. 18.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  20. 20.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  21. 21.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  22. 22.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  23. 23.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  24. 24.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  25. 25.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  27. 27.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  29. 29.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
  30. 30.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  31. 31.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  33. 33.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  34. 34.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  35. 35.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  36. 36.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  37. 37.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  38. 38.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  40. 40.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =

Answer key

  1. P = V × I
  2. 0.2
  3. 3
  4. 13.5
  5. energy used each second
  6. 1150
  7. 0.75
  8. 920
  9. 1840
  10. 345
  11. 0.5
  12. 1.2
  13. 0.5
  14. 115
  15. 460
  16. 1.8
  17. 48
  18. 0.2
  19. 1.25
  20. 2300
  21. 0.5
  22. 18
  23. 2
  24. 36
  25. 1
  26. 15
  27. 1
  28. 3
  29. 0.25
  30. 1
  31. 18
  32. 0.75
  33. 0.1
  34. 230
  35. 0.15
  36. 0.9
  37. 0.2
  38. 0.5
  39. 2.25
  40. 0.25

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