← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 989 · 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 colour of light (b) the length of a wire (c) energy used each second (d) the size of a cell
  2. 2.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = V × I (d) P = I ÷ V
  3. 3.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  4. 4.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  5. 5.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  7. 7.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  8. 8.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  9. 9.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  10. 10.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  11. 11.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  12. 12.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  13. 13.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  14. 14.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  15. 15.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  16. 16.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  18. 18.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  19. 19.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  20. 20.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  21. 21.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  22. 22.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  24. 24.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  25. 25.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  28. 28.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  29. 29.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  31. 31.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  33. 33.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  34. 34.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  35. 35.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  37. 37.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  38. 38.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  39. 39.⚡ A 12 W device works on 12 V. What current does it take (in amperes)? =
  40. 40.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =

Answer key

  1. energy used each second
  2. P = V × I
  3. 2.25
  4. 2.4
  5. 1.5
  6. 920
  7. 345
  8. 1.5
  9. 230
  10. 2300
  11. 0.3
  12. 3
  13. 6
  14. 2
  15. 0.6
  16. 5
  17. 72
  18. 3
  19. 1
  20. 2
  21. 115
  22. 0.5
  23. 24
  24. 0.2
  25. 0.1
  26. 15
  27. 1.8
  28. 0.2
  29. 0.25
  30. 4.5
  31. 0.2
  32. 0.6
  33. 1840
  34. 0.1
  35. 0.25
  36. 27
  37. 1150
  38. 1.5
  39. 1
  40. 0.2

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