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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 149 · 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.

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  1. 1.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  2. 2.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  3. 3.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  4. 4.⚡ Power tells us … (a) the size of a cell (b) the length of a wire (c) energy used each second (d) the colour of light
  5. 5.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  6. 6.⚡ Which formula gives electric power? (a) P = V × I (b) P = I ÷ V (c) P = V + I (d) P = V ÷ I
  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 24 V. What current does it take (in amperes)? =
  9. 9.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  10. 10.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  12. 12.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  14. 14.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  15. 15.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  16. 16.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  18. 18.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  19. 19.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  20. 20.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  24. 24.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  25. 25.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  26. 26.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  27. 27.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
  28. 28.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  29. 29.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  32. 32.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  34. 34.⚡ A 12 W device works on 12 V. What current does it take (in amperes)? =
  35. 35.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 5 V and takes 2 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 24 V and takes 1.5 A. What is its power (in watts)? =

Answer key

  1. 24
  2. 3
  3. 345
  4. energy used each second
  5. 9
  6. P = V × I
  7. 1.5
  8. 0.1
  9. 1.5
  10. 4.8
  11. 2300
  12. 1
  13. 460
  14. 1
  15. 0.5
  16. 1.5
  17. 6
  18. 0.75
  19. 3
  20. 0.25
  21. 1.5
  22. 6
  23. 4.5
  24. 1.5
  25. 1.5
  26. 3
  27. 2
  28. 115
  29. 0.25
  30. 4.5
  31. 1.2
  32. 0.1
  33. 2.25
  34. 1
  35. 0.5
  36. 6
  37. 0.6
  38. 10
  39. 0.6
  40. 36

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