← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 52 · 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 0.5 A. What is its power (in watts)? =
  2. 2.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  3. 3.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  4. 4.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  5. 5.⚡ Power tells us … (a) the colour of light (b) energy used each second (c) the size of a cell (d) the length of a wire
  6. 6.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  7. 7.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  8. 8.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  9. 9.⚡ Which formula gives electric power? (a) P = V + I (b) P = I ÷ V (c) P = V ÷ I (d) P = V × I
  10. 10.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  11. 11.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  13. 13.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  14. 14.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  15. 15.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  16. 16.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  18. 18.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  19. 19.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  20. 20.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  24. 24.⚡ A 12 W device works on 12 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 device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 1.5 V and takes 0.25 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 home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  30. 30.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  31. 31.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  32. 32.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  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 3 V and takes 0.25 A. What is its power (in watts)? =
  35. 35.⚡ A device works on 5 V and takes 0.2 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 device works on 9 V and takes 3 A. What is its power (in watts)? =
  38. 38.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  39. 39.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =

Answer key

  1. 6
  2. 1.2
  3. 230
  4. 0.25
  5. energy used each second
  6. 13.5
  7. 2.25
  8. 1.25
  9. P = V × I
  10. 460
  11. 3
  12. 12
  13. 2
  14. 2.5
  15. 920
  16. 6
  17. 0.3
  18. 1150
  19. 0.3
  20. 1
  21. 4.8
  22. 12
  23. 18
  24. 1
  25. 2.25
  26. 3
  27. 0.375
  28. 0.5
  29. 115
  30. 2300
  31. 0.1
  32. 2
  33. 0.15
  34. 0.75
  35. 1
  36. 9
  37. 27
  38. 1.5
  39. 0.5
  40. 0.6

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