← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 784 · 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.⚡ Power tells us … (a) the length of a wire (b) energy used each second (c) the colour of light (d) the size of a cell
  2. 2.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
  3. 3.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  4. 4.⚡ An 18 W device works on 6 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.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V + I (c) P = V × I (d) P = I ÷ V
  7. 7.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  8. 8.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  9. 9.⚡ A device works on 3 V and takes 3 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 home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  12. 12.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  13. 13.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  15. 15.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  16. 16.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  17. 17.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  20. 20.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  21. 21.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  22. 22.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  24. 24.⚡ A home appliance on the 230 V mains takes 1.5 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 device works on 9 V and takes 2 A. What is its power (in watts)? =
  27. 27.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  32. 32.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  34. 34.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  35. 35.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  36. 36.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  38. 38.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  39. 39.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =

Answer key

  1. energy used each second
  2. 0.25
  3. 230
  4. 3
  5. 1840
  6. P = V × I
  7. 0.2
  8. 0.1
  9. 9
  10. 1150
  11. 2300
  12. 1.5
  13. 0.5
  14. 460
  15. 2.4
  16. 15
  17. 0.25
  18. 0.3
  19. 0.75
  20. 920
  21. 0.25
  22. 2.25
  23. 13.5
  24. 345
  25. 24
  26. 18
  27. 0.1
  28. 1.5
  29. 0.3
  30. 1
  31. 4.8
  32. 0.5
  33. 3
  34. 12
  35. 115
  36. 0.5
  37. 7.5
  38. 2
  39. 2
  40. 1.2

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