← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 125 · 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.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V + I (c) P = V ÷ I (d) P = V × I
  2. 2.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  3. 3.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  4. 4.⚡ Power tells us … (a) the length of a wire (b) the colour of light (c) the size of a cell (d) energy used each second
  5. 5.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  7. 7.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  8. 8.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  9. 9.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  10. 10.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  11. 11.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  12. 12.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  13. 13.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  14. 14.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  15. 15.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  16. 16.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  17. 17.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  18. 18.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  20. 20.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  22. 22.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  24. 24.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  25. 25.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  26. 26.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  32. 32.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  34. 34.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  35. 35.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  36. 36.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  38. 38.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  39. 39.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =

Answer key

  1. P = V × I
  2. 2
  3. 0.6
  4. energy used each second
  5. 2
  6. 460
  7. 1840
  8. 230
  9. 345
  10. 2300
  11. 0.6
  12. 115
  13. 2
  14. 72
  15. 0.3
  16. 1150
  17. 2.4
  18. 0.25
  19. 18
  20. 2
  21. 18
  22. 0.25
  23. 15
  24. 0.25
  25. 48
  26. 12
  27. 18
  28. 4.5
  29. 24
  30. 36
  31. 6
  32. 0.5
  33. 1.2
  34. 1.5
  35. 920
  36. 0.375
  37. 0.5
  38. 0.2
  39. 0.1
  40. 9

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids