← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 47 · 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 5 A. What is its power (in watts)?
  2. 2.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  3. 3.⚡ Which formula gives electric power? (a) P = V × I (b) P = V ÷ I (c) P = I ÷ V (d) P = V + I
  4. 4.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  5. 5.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  6. 6.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  7. 7.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  8. 8.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  9. 9.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  10. 10.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  11. 11.⚡ Power tells us … (a) the size of a cell (b) the colour of light (c) the length of a wire (d) energy used each second
  12. 12.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  13. 13.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  14. 14.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  15. 15.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  18. 18.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  19. 19.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  20. 20.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  21. 21.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  22. 22.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  23. 23.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  24. 24.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  25. 25.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  27. 27.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  29. 29.⚡ A 1.5 W device works on 1.5 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 home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  32. 32.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  33. 33.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  34. 34.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  35. 35.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  36. 36.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  37. 37.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  38. 38.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =

Answer key

  1. 1150
  2. 9
  3. P = V × I
  4. 3
  5. 4.8
  6. 15
  7. 460
  8. 0.9
  9. 2300
  10. 3
  11. energy used each second
  12. 345
  13. 1.5
  14. 1
  15. 1.5
  16. 2.4
  17. 27
  18. 920
  19. 2.4
  20. 6
  21. 0.5
  22. 0.6
  23. 0.1
  24. 1840
  25. 1
  26. 2.25
  27. 0.1
  28. 4.5
  29. 1
  30. 0.25
  31. 230
  32. 3
  33. 1.5
  34. 115
  35. 0.1
  36. 1
  37. 0.1
  38. 3
  39. 1.2
  40. 1.5

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