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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 288 · 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 = V + I (c) P = V ÷ I (d) P = I ÷ V
  2. 2.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  3. 3.⚡ Power tells us … (a) the size of a cell (b) energy used each second (c) the length of a wire (d) the colour of light
  4. 4.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  5. 5.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  6. 6.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  7. 7.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  8. 8.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  9. 9.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  12. 12.⚡ A 48 W device works on 24 V. What current does it take (in amperes)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  14. 14.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  15. 15.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  16. 16.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
  18. 18.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  19. 19.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  20. 20.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  21. 21.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  24. 24.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  25. 25.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  28. 28.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  30. 30.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  31. 31.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  33. 33.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  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 8 A. What is its power (in watts)?
  36. 36.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  38. 38.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =

Answer key

  1. P = V × I
  2. 9
  3. energy used each second
  4. 3
  5. 18
  6. 3
  7. 48
  8. 4.8
  9. 0.3
  10. 13.5
  11. 230
  12. 2
  13. 1150
  14. 6
  15. 920
  16. 0.2
  17. 1.5
  18. 2300
  19. 460
  20. 345
  21. 3
  22. 0.15
  23. 2.4
  24. 0.5
  25. 1.5
  26. 10
  27. 36
  28. 3
  29. 3
  30. 1.5
  31. 72
  32. 0.3
  33. 1.5
  34. 0.5
  35. 1840
  36. 1
  37. 0.375
  38. 0.2
  39. 2.4
  40. 1.5

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