← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 735 · 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 1.5 V. What current does it take (in amperes)? =
  2. 2.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  3. 3.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  4. 4.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  5. 5.⚡ Power tells us … (a) the size of a cell (b) the colour of light (c) energy used each second (d) the length of a wire
  6. 6.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  7. 7.⚡ A device works on 9 V and takes 1.5 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 6 W device works on 3 V. What current does it take (in amperes)? =
  10. 10.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  11. 11.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  12. 12.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  15. 15.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V × I (c) P = V + I (d) P = I ÷ V
  16. 16.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  18. 18.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  19. 19.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  20. 20.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  21. 21.⚡ A 48 W device works on 24 V. What current does it take (in amperes)? =
  22. 22.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  26. 26.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  27. 27.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  28. 28.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  29. 29.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 6 V and takes 1.5 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 0.75 W device works on 3 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  35. 35.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  36. 36.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  37. 37.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  38. 38.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  39. 39.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  40. 40.⚡ An 18 W device works on 6 V. What current does it take (in amperes)? =

Answer key

  1. 0.5
  2. 1.8
  3. 2.5
  4. 2300
  5. energy used each second
  6. 230
  7. 13.5
  8. 2
  9. 2
  10. 345
  11. 0.9
  12. 18
  13. 4.5
  14. 1840
  15. P = V × I
  16. 2.25
  17. 18
  18. 0.5
  19. 0.1
  20. 10
  21. 2
  22. 1
  23. 6
  24. 0.3
  25. 24
  26. 460
  27. 920
  28. 0.15
  29. 3
  30. 36
  31. 9
  32. 4.8
  33. 0.25
  34. 27
  35. 2
  36. 0.2
  37. 0.1
  38. 1.25
  39. 1.5
  40. 3

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