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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 548 · 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.⚡ Power tells us … (a) energy used each second (b) the length of a wire (c) the colour of light (d) the size of a cell
  2. 2.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  3. 3.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  4. 4.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  5. 5.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  6. 6.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  7. 7.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  8. 8.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
  9. 9.⚡ An 18 W device works on 6 V. What current does it take (in amperes)? =
  10. 10.⚡ A device works on 1.5 V and takes 0.25 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.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = I ÷ V (c) P = V × I (d) P = V + I
  13. 13.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  14. 14.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  15. 15.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  16. 16.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  17. 17.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  20. 20.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  21. 21.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  22. 22.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  23. 23.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  24. 24.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  26. 26.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  27. 27.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  28. 28.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  29. 29.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  30. 30.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  31. 31.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  33. 33.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  34. 34.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  35. 35.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  36. 36.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  38. 38.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  39. 39.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =

Answer key

  1. energy used each second
  2. 36
  3. 2.25
  4. 345
  5. 2
  6. 6
  7. 6
  8. 0.25
  9. 3
  10. 0.375
  11. 1150
  12. P = V × I
  13. 230
  14. 0.2
  15. 48
  16. 4.8
  17. 0.5
  18. 18
  19. 2.5
  20. 1.25
  21. 15
  22. 2300
  23. 920
  24. 4.5
  25. 0.3
  26. 1.5
  27. 115
  28. 0.5
  29. 0.2
  30. 3
  31. 5
  32. 0.15
  33. 1840
  34. 12
  35. 27
  36. 2
  37. 4.5
  38. 460
  39. 36
  40. 18

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