← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 742 · 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 home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  2. 2.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  3. 3.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  4. 4.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  5. 5.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  6. 6.⚡ Power tells us … (a) energy used each second (b) the size of a cell (c) the colour of light (d) the length of a wire
  7. 7.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  8. 8.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V × I (d) P = V + I
  9. 9.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  10. 10.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  11. 11.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  14. 14.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  15. 15.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  16. 16.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  17. 17.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  18. 18.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  19. 19.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  20. 20.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  25. 25.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  28. 28.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  33. 33.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
  34. 34.⚡ An 18 W device works on 6 V. What current does it take (in amperes)? =
  35. 35.⚡ A 7.5 W device works on 5 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 1.5 V and takes 0.25 A. What is its power (in watts)? =
  38. 38.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  39. 39.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  40. 40.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =

Answer key

  1. 230
  2. 9
  3. 0.2
  4. 3
  5. 1840
  6. energy used each second
  7. 345
  8. P = V × I
  9. 2300
  10. 1150
  11. 0.1
  12. 9
  13. 460
  14. 0.2
  15. 0.75
  16. 115
  17. 3
  18. 3
  19. 1
  20. 0.1
  21. 7.5
  22. 18
  23. 12
  24. 36
  25. 0.5
  26. 0.6
  27. 24
  28. 0.1
  29. 1
  30. 18
  31. 13.5
  32. 0.9
  33. 0.25
  34. 3
  35. 1.5
  36. 10
  37. 0.375
  38. 0.25
  39. 1
  40. 0.25

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