← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 90 · 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 home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  2. 2.⚡ Power tells us … (a) the size of a cell (b) energy used each second (c) the length of a wire (d) the colour of light
  3. 3.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  4. 4.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = V × I (d) P = I ÷ V
  5. 5.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  6. 6.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  7. 7.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  8. 8.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  9. 9.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  10. 10.⚡ A home appliance on the 230 V mains takes 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 home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  13. 13.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  14. 14.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  15. 15.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  18. 18.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  20. 20.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  21. 21.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  22. 22.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  23. 23.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  24. 24.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  25. 25.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  27. 27.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  29. 29.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  30. 30.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
  31. 31.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  34. 34.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  35. 35.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  36. 36.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  37. 37.⚡ A 12 W device works on 24 V. What current does it take (in amperes)? =
  38. 38.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  39. 39.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =

Answer key

  1. 115
  2. energy used each second
  3. 3
  4. P = V × I
  5. 460
  6. 345
  7. 920
  8. 18
  9. 0.25
  10. 1150
  11. 1840
  12. 230
  13. 2.4
  14. 0.5
  15. 0.2
  16. 4.5
  17. 1.8
  18. 0.1
  19. 24
  20. 48
  21. 2300
  22. 0.1
  23. 0.2
  24. 0.1
  25. 1.5
  26. 12
  27. 0.1
  28. 9
  29. 1.5
  30. 0.25
  31. 2
  32. 2.25
  33. 3
  34. 0.1
  35. 0.75
  36. 10
  37. 0.5
  38. 1
  39. 0.5
  40. 4.5

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