← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 99 · 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 size of a cell (d) the colour of light
  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 24 V and takes 0.1 A. What is its power (in watts)? =
  4. 4.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  5. 5.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  7. 7.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  8. 8.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  9. 9.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  10. 10.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  11. 11.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  12. 12.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  14. 14.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  15. 15.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  16. 16.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  17. 17.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  19. 19.⚡ A 12 W device works on 24 V. What current does it take (in amperes)? =
  20. 20.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  23. 23.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  24. 24.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  25. 25.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  26. 26.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  27. 27.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  28. 28.⚡ A 12 W device works on 12 V. What current does it take (in amperes)? =
  29. 29.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  30. 30.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  31. 31.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  34. 34.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
  35. 35.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  36. 36.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  37. 37.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  38. 38.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  39. 39.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  40. 40.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =

Answer key

  1. energy used each second
  2. P = V × I
  3. 2.4
  4. 0.375
  5. 0.2
  6. 1150
  7. 1.5
  8. 0.2
  9. 1.2
  10. 920
  11. 460
  12. 0.25
  13. 1840
  14. 2300
  15. 115
  16. 24
  17. 0.2
  18. 3
  19. 0.5
  20. 2
  21. 1
  22. 6
  23. 230
  24. 0.3
  25. 0.1
  26. 0.5
  27. 3
  28. 1
  29. 0.1
  30. 0.2
  31. 4.8
  32. 36
  33. 6
  34. 2
  35. 345
  36. 9
  37. 0.1
  38. 0.15
  39. 27
  40. 3

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