← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 214 · 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 3 V and takes 0.5 A. What is its power (in watts)? =
  2. 2.⚡ 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
  3. 3.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
  4. 4.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  5. 5.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  6. 6.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  7. 7.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V × I (c) P = I ÷ V (d) P = V + I
  8. 8.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  9. 9.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  11. 11.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  12. 12.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  13. 13.⚡ A 12 W device works on 24 V. What current does it take (in amperes)? =
  14. 14.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  15. 15.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  16. 16.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  17. 17.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  18. 18.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  19. 19.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  20. 20.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  23. 23.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
  24. 24.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  25. 25.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  26. 26.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  27. 27.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  30. 30.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  31. 31.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  32. 32.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  33. 33.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  34. 34.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  35. 35.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  36. 36.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  38. 38.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =

Answer key

  1. 1.5
  2. energy used each second
  3. 0.25
  4. 2.4
  5. 1
  6. 0.6
  7. P = V × I
  8. 115
  9. 3
  10. 9
  11. 1
  12. 3
  13. 0.5
  14. 3
  15. 1840
  16. 6
  17. 460
  18. 230
  19. 0.6
  20. 2
  21. 24
  22. 3
  23. 0.25
  24. 18
  25. 920
  26. 4.8
  27. 0.1
  28. 10
  29. 4.5
  30. 3
  31. 0.2
  32. 345
  33. 1
  34. 3
  35. 1.5
  36. 0.1
  37. 5
  38. 0.25
  39. 3
  40. 1

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