← Electric power lesson New set →

Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 374 · 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 1 A. What is its power (in watts)?
  2. 2.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  3. 3.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  4. 4.⚡ Power tells us … (a) the colour of light (b) the length of a wire (c) the size of a cell (d) energy used each second
  5. 5.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  6. 6.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  7. 7.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  8. 8.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = I ÷ V (d) P = V × I
  9. 9.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  10. 10.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  12. 12.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  13. 13.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  14. 14.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  15. 15.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  16. 16.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  18. 18.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  20. 20.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  21. 21.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  22. 22.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  23. 23.⚡ A 0.5 W device works on 5 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 device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  26. 26.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  27. 27.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  28. 28.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  29. 29.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  30. 30.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  31. 31.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  34. 34.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V + I (d) P = V × I
  35. 35.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  36. 36.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  39. 39.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =

Answer key

  1. 230
  2. 0.3
  3. 3
  4. energy used each second
  5. 0.25
  6. 18
  7. 2.4
  8. P = V × I
  9. 0.9
  10. 0.25
  11. 2300
  12. 1150
  13. 12
  14. 0.1
  15. 0.1
  16. 0.2
  17. 1.5
  18. 36
  19. 4.5
  20. 24
  21. 0.2
  22. 1.5
  23. 0.1
  24. 1840
  25. 0.75
  26. 115
  27. 0.6
  28. 345
  29. 2
  30. 0.2
  31. 4.5
  32. 12
  33. 3
  34. P = V × I
  35. 2
  36. 0.25
  37. 1.2
  38. 9
  39. 0.6
  40. 24

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