← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 211 · 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 = V ÷ I (b) P = V × I (c) P = V + I (d) P = I ÷ V
  2. 2.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  3. 3.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  4. 4.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  5. 5.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  7. 7.⚡ A device works on 3 V and takes 1.5 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 device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  10. 10.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  11. 11.⚡ A 48 W device works on 24 V. What current does it take (in amperes)? =
  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 0.5 A. What is its power (in watts)?
  14. 14.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  15. 15.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 5 V and takes 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.⚡ Power tells us … (a) the size of a cell (b) energy used each second (c) the colour of light (d) the length of a wire
  20. 20.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  21. 21.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  22. 22.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  23. 23.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  26. 26.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  27. 27.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  28. 28.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  29. 29.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  30. 30.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  31. 31.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  33. 33.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  34. 34.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  35. 35.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  36. 36.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  37. 37.⚡ A 12 W device works on 24 V. What current does it take (in amperes)? =
  38. 38.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  39. 39.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =

Answer key

  1. P = V × I
  2. 1
  3. 2.25
  4. 460
  5. 1.2
  6. 2300
  7. 4.5
  8. 230
  9. 1.25
  10. 0.2
  11. 2
  12. 0.2
  13. 115
  14. 3
  15. 1.5
  16. 4.8
  17. 10
  18. 1150
  19. energy used each second
  20. 1
  21. 3
  22. 345
  23. 36
  24. 3
  25. 27
  26. 0.1
  27. 0.25
  28. 0.5
  29. 1840
  30. 1
  31. 3
  32. 4.5
  33. 920
  34. 0.5
  35. 72
  36. 0.1
  37. 0.5
  38. 6
  39. 0.1
  40. 1.8

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