← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 318 · 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 0.75 W device works on 3 V. What current does it take (in amperes)? =
  2. 2.⚡ Power tells us … (a) the length of a wire (b) energy used each second (c) the size of a cell (d) the colour of light
  3. 3.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  4. 4.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  5. 5.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  6. 6.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V × I (c) P = I ÷ V (d) P = V + I
  7. 7.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  8. 8.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
  9. 9.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  10. 10.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  11. 11.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  12. 12.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  13. 13.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  14. 14.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  15. 15.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  16. 16.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  17. 17.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  20. 20.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  21. 21.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  22. 22.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  26. 26.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  27. 27.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  28. 28.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  30. 30.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  31. 31.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  34. 34.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  35. 35.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  39. 39.⚡ A home appliance on the 230 V mains takes 5 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. 0.25
  2. energy used each second
  3. 1
  4. 920
  5. 2
  6. P = V × I
  7. 115
  8. 2
  9. 0.75
  10. 460
  11. 1.25
  12. 0.1
  13. 36
  14. 1.5
  15. 4.5
  16. 0.2
  17. 0.5
  18. 2.5
  19. 0.6
  20. 345
  21. 1840
  22. 18
  23. 0.6
  24. 0.5
  25. 15
  26. 1
  27. 1.5
  28. 0.25
  29. 2.25
  30. 0.5
  31. 3
  32. 4.8
  33. 0.15
  34. 3
  35. 0.5
  36. 10
  37. 1.8
  38. 0.9
  39. 1150
  40. 18

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