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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 181 · 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.⚡ Power tells us … (a) energy used each second (b) the size of a cell (c) the colour of light (d) the length of a wire
  2. 2.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = I ÷ V (d) P = V × I
  3. 3.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  4. 4.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  5. 5.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  7. 7.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  8. 8.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  9. 9.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
  10. 10.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  12. 12.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  13. 13.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  14. 14.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  15. 15.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  16. 16.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  17. 17.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  18. 18.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  19. 19.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  20. 20.⚡ A 12 W device works on 24 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  23. 23.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  24. 24.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  25. 25.⚡ A 12 W device works on 12 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  27. 27.⚡ A 36 W device works on 12 V. What current does it take (in amperes)? =
  28. 28.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  29. 29.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  30. 30.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  31. 31.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  34. 34.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  35. 35.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  36. 36.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  38. 38.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  39. 39.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  40. 40.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =

Answer key

  1. energy used each second
  2. P = V × I
  3. 1150
  4. 920
  5. 10
  6. 345
  7. 2.4
  8. 0.375
  9. 0.25
  10. 4.8
  11. 2300
  12. 1.8
  13. 0.1
  14. 0.1
  15. 0.75
  16. 230
  17. 1.5
  18. 1840
  19. 4.5
  20. 0.5
  21. 15
  22. 1.2
  23. 0.5
  24. 0.1
  25. 1
  26. 9
  27. 3
  28. 0.2
  29. 0.1
  30. 0.25
  31. 3
  32. 12
  33. 2.25
  34. 0.5
  35. 460
  36. 1.5
  37. 9
  38. 1
  39. 115
  40. 2.4

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