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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 445 · 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 home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  2. 2.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V × I (d) P = V + I
  3. 3.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  4. 4.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  5. 5.⚡ 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
  6. 6.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  7. 7.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  8. 8.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  9. 9.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  10. 10.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  11. 11.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  12. 12.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  14. 14.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  15. 15.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  18. 18.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  20. 20.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  23. 23.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  24. 24.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  25. 25.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  26. 26.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  27. 27.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  28. 28.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
  29. 29.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  30. 30.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  31. 31.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  34. 34.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  35. 35.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 24 V and takes 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 device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  39. 39.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =

Answer key

  1. 1840
  2. P = V × I
  3. 48
  4. 0.1
  5. energy used each second
  6. 0.25
  7. 2
  8. 2.4
  9. 345
  10. 1.5
  11. 3
  12. 6
  13. 230
  14. 1.5
  15. 1
  16. 18
  17. 12
  18. 1
  19. 0.5
  20. 0.25
  21. 36
  22. 0.3
  23. 0.1
  24. 0.2
  25. 3
  26. 0.75
  27. 1150
  28. 0.25
  29. 3
  30. 115
  31. 2.4
  32. 1.2
  33. 1
  34. 0.5
  35. 0.1
  36. 24
  37. 0.2
  38. 1.8
  39. 24
  40. 4.5

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