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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 909 · 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 device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  2. 2.⚡ Which formula gives electric power? (a) P = V × I (b) P = I ÷ V (c) P = V ÷ I (d) P = V + I
  3. 3.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  4. 4.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  5. 5.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  6. 6.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  7. 7.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  8. 8.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  9. 9.⚡ Power tells us … (a) the size of a cell (b) the length of a wire (c) energy used each second (d) the colour of light
  10. 10.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  12. 12.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  14. 14.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  15. 15.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  16. 16.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  17. 17.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  18. 18.⚡ A device works on 5 V and takes 1.5 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 device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  21. 21.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  22. 22.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  23. 23.⚡ An 18 W device works on 6 V. What current does it take (in amperes)? =
  24. 24.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  26. 26.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  27. 27.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  29. 29.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  33. 33.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  34. 34.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  35. 35.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  36. 36.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  37. 37.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  38. 38.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  39. 39.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =

Answer key

  1. 18
  2. P = V × I
  3. 1.5
  4. 6
  5. 6
  6. 0.1
  7. 920
  8. 1.5
  9. energy used each second
  10. 4.5
  11. 1150
  12. 0.2
  13. 345
  14. 0.5
  15. 115
  16. 0.25
  17. 1840
  18. 7.5
  19. 460
  20. 1.2
  21. 0.25
  22. 0.2
  23. 3
  24. 0.75
  25. 0.6
  26. 0.1
  27. 0.5
  28. 2.4
  29. 1.5
  30. 0.9
  31. 72
  32. 0.3
  33. 230
  34. 6
  35. 18
  36. 1.5
  37. 0.2
  38. 0.5
  39. 36
  40. 0.15

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