← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 174 · 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 device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  2. 2.⚡ Power tells us … (a) energy used each second (b) the length of a wire (c) the colour of light (d) the size of a cell
  3. 3.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  4. 4.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  5. 5.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  6. 6.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  7. 7.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  8. 8.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  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 6 V and takes 0.25 A. What is its power (in watts)? =
  11. 11.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V + I (c) P = I ÷ V (d) P = V × I
  12. 12.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  13. 13.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  14. 14.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  15. 15.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  18. 18.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  20. 20.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  21. 21.⚡ A 48 W device works on 24 V. What current does it take (in amperes)? =
  22. 22.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  23. 23.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  24. 24.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  25. 25.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  27. 27.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  28. 28.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  30. 30.⚡ An 18 W device works on 6 V. What current does it take (in amperes)? =
  31. 31.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  32. 32.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  33. 33.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  34. 34.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  35. 35.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  36. 36.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  38. 38.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =

Answer key

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

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