← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 353 · 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.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V × I (d) P = V + I
  2. 2.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  3. 3.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  4. 4.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  5. 5.⚡ Power tells us … (a) energy used each second (b) the length of a wire (c) the colour of light (d) the size of a cell
  6. 6.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  7. 7.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  8. 8.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  9. 9.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  11. 11.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  12. 12.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  14. 14.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  15. 15.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  16. 16.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  18. 18.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  19. 19.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  20. 20.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  21. 21.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  22. 22.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  23. 23.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  24. 24.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  26. 26.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  27. 27.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  28. 28.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  30. 30.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  31. 31.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  33. 33.⚡ A 0.6 W device works on 6 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 0.6 W device works on 3 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  37. 37.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  38. 38.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  40. 40.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =

Answer key

  1. P = V × I
  2. 0.2
  3. 345
  4. 6
  5. energy used each second
  6. 0.375
  7. 1.5
  8. 0.75
  9. 24
  10. 24
  11. 0.6
  12. 0.1
  13. 115
  14. 920
  15. 0.1
  16. 0.5
  17. 1.8
  18. 1.25
  19. 1840
  20. 0.15
  21. 1150
  22. 2300
  23. 1.5
  24. 9
  25. 72
  26. 230
  27. 460
  28. 0.25
  29. 2.5
  30. 0.2
  31. 1
  32. 18
  33. 0.1
  34. 3
  35. 0.2
  36. 3
  37. 0.2
  38. 0.25
  39. 9
  40. 0.1

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