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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 406 · 40 questions
TalentJR

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 = I ÷ V (b) P = V × I (c) P = V ÷ I (d) P = V + I
  2. 2.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  3. 3.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  4. 4.⚡ Power tells us … (a) the size of a cell (b) the colour of light (c) energy used each second (d) the length of a wire
  5. 5.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  6. 6.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  7. 7.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  8. 8.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  9. 9.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  10. 10.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  11. 11.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  12. 12.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  13. 13.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  14. 14.⚡ A device works on 3 V and takes 0.1 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 8 A. What is its power (in watts)?
  17. 17.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  18. 18.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  19. 19.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  20. 20.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  22. 22.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  23. 23.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  24. 24.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  26. 26.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  27. 27.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  30. 30.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  31. 31.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  34. 34.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  35. 35.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  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 0.1 A. What is its power (in watts)? =
  38. 38.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  40. 40.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =

Answer key

  1. P = V × I
  2. 0.1
  3. 3
  4. energy used each second
  5. 2.5
  6. 2
  7. 1.5
  8. 1
  9. 460
  10. 0.25
  11. 1.8
  12. 27
  13. 1.5
  14. 0.3
  15. 920
  16. 1840
  17. 2
  18. 115
  19. 2
  20. 0.2
  21. 4.5
  22. 345
  23. 1.5
  24. 6
  25. 10
  26. 3
  27. 9
  28. 7.5
  29. 0.3
  30. 2
  31. 9
  32. 4.8
  33. 24
  34. 3
  35. 0.2
  36. 3
  37. 2.4
  38. 0.25
  39. 0.6
  40. 0.25

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