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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 624 · 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 0.2 A. What is its power (in watts)? =
  2. 2.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  3. 3.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  4. 4.⚡ Which formula gives electric power? (a) P = V × I (b) P = V + I (c) P = V ÷ I (d) P = I ÷ V
  5. 5.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  6. 6.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  7. 7.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  9. 9.⚡ A 48 W device works on 24 V. What current does it take (in amperes)? =
  10. 10.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  12. 12.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  13. 13.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
  14. 14.⚡ Power tells us … (a) the colour of light (b) the size of a cell (c) the length of a wire (d) energy used each second
  15. 15.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  16. 16.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  17. 17.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  18. 18.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  20. 20.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  21. 21.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  22. 22.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  23. 23.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  24. 24.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  25. 25.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  30. 30.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  31. 31.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  32. 32.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  33. 33.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  34. 34.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  35. 35.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  36. 36.⚡ An 18 W device works on 6 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  39. 39.⚡ A device works on 6 V and takes 1 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. 0.6
  2. 4.5
  3. 3
  4. P = V × I
  5. 0.9
  6. 3
  7. 0.25
  8. 1840
  9. 2
  10. 1
  11. 115
  12. 24
  13. 2
  14. energy used each second
  15. 0.2
  16. 460
  17. 2.25
  18. 1.5
  19. 12
  20. 0.5
  21. 2300
  22. 920
  23. 345
  24. 0.1
  25. 0.25
  26. 18
  27. 13.5
  28. 9
  29. 0.75
  30. 3
  31. 1
  32. 1150
  33. 1.5
  34. 0.2
  35. 18
  36. 3
  37. 72
  38. 0.75
  39. 6
  40. 0.5

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