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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 316 · 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 27 W device works on 9 V. What current does it take (in amperes)? =
  2. 2.⚡ Power tells us … (a) the length of a wire (b) the colour of light (c) energy used each second (d) the size of a cell
  3. 3.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  4. 4.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  5. 5.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
  6. 6.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V + I (c) P = V × I (d) P = V ÷ I
  7. 7.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  9. 9.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  10. 10.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  11. 11.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  12. 12.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  13. 13.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  15. 15.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  17. 17.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  18. 18.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  20. 20.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  22. 22.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  23. 23.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  24. 24.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  26. 26.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  27. 27.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  28. 28.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  32. 32.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  33. 33.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  34. 34.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  35. 35.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  38. 38.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  39. 39.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  40. 40.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =

Answer key

  1. 3
  2. energy used each second
  3. 1
  4. 0.2
  5. 0.25
  6. P = V × I
  7. 5
  8. 1150
  9. 230
  10. 920
  11. 3
  12. 0.5
  13. 1
  14. 2300
  15. 0.1
  16. 1.8
  17. 0.25
  18. 1.5
  19. 48
  20. 0.5
  21. 1.2
  22. 0.5
  23. 0.1
  24. 2.25
  25. 12
  26. 115
  27. 0.6
  28. 0.1
  29. 24
  30. 9
  31. 1.25
  32. 0.2
  33. 3
  34. 0.2
  35. 0.1
  36. 0.15
  37. 36
  38. 0.5
  39. 0.1
  40. 2

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