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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 302 · 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.

NameDateTime takenScore ___ / 40
  1. 1.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  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 2.4 W device works on 24 V. What current does it take (in amperes)? =
  4. 4.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  5. 5.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  6. 6.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  7. 7.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  8. 8.⚡ Power tells us … (a) the colour of light (b) the length of a wire (c) the size of a cell (d) energy used each second
  9. 9.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  10. 10.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  11. 11.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  13. 13.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  15. 15.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  16. 16.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  17. 17.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  18. 18.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  19. 19.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  20. 20.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  21. 21.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  23. 23.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
  24. 24.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  25. 25.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  26. 26.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  27. 27.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  29. 29.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  30. 30.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  34. 34.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  35. 35.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  36. 36.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  37. 37.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  38. 38.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  39. 39.⚡ A 12 W device works on 12 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =

Answer key

  1. 0.2
  2. P = V × I
  3. 0.1
  4. 1.5
  5. 115
  6. 920
  7. 18
  8. energy used each second
  9. 2
  10. 36
  11. 1
  12. 6
  13. 0.2
  14. 230
  15. 0.2
  16. 0.2
  17. 0.2
  18. 345
  19. 1.5
  20. 0.3
  21. 0.3
  22. 72
  23. 0.25
  24. 0.5
  25. 2.25
  26. 1150
  27. 15
  28. 2.25
  29. 2300
  30. 12
  31. 24
  32. 27
  33. 0.15
  34. 9
  35. 460
  36. 9
  37. 0.25
  38. 0.25
  39. 1
  40. 2.4

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