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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 354 · 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 6 V and takes 0.1 A. What is its power (in watts)? =
  2. 2.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  3. 3.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  4. 4.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V × I (d) P = V + I
  5. 5.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  6. 6.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  7. 7.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  8. 8.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  9. 9.⚡ Power tells us … (a) energy used each second (b) the length of a wire (c) the size of a cell (d) the colour of light
  10. 10.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  11. 11.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
  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 3 V and takes 0.5 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 home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  17. 17.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  18. 18.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  19. 19.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  20. 20.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  21. 21.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  25. 25.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  28. 28.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  29. 29.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  31. 31.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  32. 32.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  34. 34.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  35. 35.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
  36. 36.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  39. 39.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =

Answer key

  1. 0.6
  2. 9
  3. 0.5
  4. P = V × I
  5. 2300
  6. 460
  7. 48
  8. 0.1
  9. energy used each second
  10. 6
  11. 3
  12. 1.5
  13. 1150
  14. 1.5
  15. 920
  16. 230
  17. 0.25
  18. 0.2
  19. 1840
  20. 12
  21. 2.25
  22. 24
  23. 5
  24. 0.6
  25. 3
  26. 0.15
  27. 0.3
  28. 345
  29. 0.5
  30. 13.5
  31. 115
  32. 2
  33. 1.2
  34. 7.5
  35. 2
  36. 0.5
  37. 0.9
  38. 1
  39. 1.5
  40. 15

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