← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 22 · 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 = V ÷ I (b) P = V × I (c) P = I ÷ V (d) P = V + I
  2. 2.⚡ 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
  3. 3.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  4. 4.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  5. 5.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  6. 6.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  7. 7.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  9. 9.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  12. 12.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  14. 14.⚡ A 12 W device works on 12 V. What current does it take (in amperes)? =
  15. 15.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  16. 16.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  18. 18.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  19. 19.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  20. 20.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  21. 21.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  22. 22.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  23. 23.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  24. 24.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  25. 25.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  26. 26.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  30. 30.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  31. 31.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  32. 32.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  34. 34.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  35. 35.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  36. 36.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  37. 37.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
  38. 38.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  39. 39.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  40. 40.⚡ A 12 W device works on 24 V. What current does it take (in amperes)? =

Answer key

  1. P = V × I
  2. energy used each second
  3. 0.25
  4. 345
  5. 10
  6. 12
  7. 0.1
  8. 460
  9. 1.5
  10. 7.5
  11. 1840
  12. 1.2
  13. 3
  14. 1
  15. 36
  16. 1.5
  17. 0.6
  18. 0.1
  19. 230
  20. 1
  21. 0.2
  22. 0.1
  23. 0.25
  24. 1.5
  25. 4.8
  26. 1.5
  27. 0.15
  28. 1.2
  29. 1.8
  30. 3
  31. 920
  32. 2
  33. 24
  34. 2
  35. 0.25
  36. 2300
  37. 0.25
  38. 0.6
  39. 115
  40. 0.5

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