← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 9 · 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 5 V and takes 1.5 A. What is its power (in watts)? =
  2. 2.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  3. 3.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  4. 4.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  5. 5.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  6. 6.⚡ 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
  7. 7.⚡ A 48 W device works on 24 V. What current does it take (in amperes)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  9. 9.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  11. 11.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  12. 12.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  13. 13.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  15. 15.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  16. 16.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  18. 18.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  20. 20.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  21. 21.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V × I (c) P = V + I (d) P = I ÷ V
  22. 22.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  23. 23.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  24. 24.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  25. 25.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  26. 26.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  27. 27.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  28. 28.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  31. 31.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  32. 32.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  33. 33.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  34. 34.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  35. 35.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  37. 37.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  38. 38.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  39. 39.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  40. 40.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =

Answer key

  1. 7.5
  2. 1840
  3. 72
  4. 12
  5. 4.5
  6. energy used each second
  7. 2
  8. 920
  9. 4.8
  10. 27
  11. 3
  12. 0.1
  13. 0.25
  14. 230
  15. 345
  16. 0.25
  17. 2.5
  18. 13.5
  19. 24
  20. 0.5
  21. P = V × I
  22. 2.4
  23. 460
  24. 0.2
  25. 1150
  26. 115
  27. 1.5
  28. 1
  29. 3
  30. 0.5
  31. 0.2
  32. 2300
  33. 6
  34. 0.25
  35. 0.1
  36. 6
  37. 1.5
  38. 18
  39. 4.5
  40. 0.5

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