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Electronics Worksheet: Electric Power

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

Answer key

  1. P = V × I
  2. 1840
  3. 0.2
  4. 2.4
  5. 5
  6. 2300
  7. 0.5
  8. 6
  9. 230
  10. 345
  11. energy used each second
  12. 0.9
  13. 3
  14. 1150
  15. 0.15
  16. 0.375
  17. 2
  18. 0.25
  19. 3
  20. 15
  21. 4.5
  22. 1.5
  23. 0.75
  24. 6
  25. 0.1
  26. 3
  27. 6
  28. 920
  29. 0.25
  30. 0.2
  31. 3
  32. 0.5
  33. 13.5
  34. 0.5
  35. 0.3
  36. 115
  37. 1
  38. 0.1
  39. 1.25
  40. 0.5

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