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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 674 · 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.⚡ Which formula gives electric power? (a) P = V + I (b) P = I ÷ V (c) P = V ÷ I (d) P = V × I
  2. 2.⚡ A 12 W device works on 24 V. What current does it take (in amperes)? =
  3. 3.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  4. 4.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  5. 5.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  6. 6.⚡ Power tells us … (a) the size of a cell (b) the length of a wire (c) the colour of light (d) energy used each second
  7. 7.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  8. 8.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  9. 9.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  10. 10.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  12. 12.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  14. 14.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
  15. 15.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  16. 16.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  17. 17.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  20. 20.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  21. 21.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  22. 22.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  25. 25.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  26. 26.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  27. 27.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  28. 28.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  29. 29.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  30. 30.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  33. 33.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  34. 34.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  35. 35.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  36. 36.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  38. 38.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  40. 40.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =

Answer key

  1. P = V × I
  2. 0.5
  3. 0.2
  4. 24
  5. 0.3
  6. energy used each second
  7. 0.6
  8. 0.1
  9. 0.5
  10. 72
  11. 345
  12. 0.5
  13. 920
  14. 0.25
  15. 115
  16. 1.2
  17. 0.25
  18. 2.4
  19. 0.6
  20. 3
  21. 1840
  22. 1.5
  23. 27
  24. 15
  25. 1150
  26. 460
  27. 18
  28. 0.5
  29. 230
  30. 12
  31. 4.8
  32. 0.3
  33. 0.2
  34. 0.5
  35. 2.5
  36. 0.2
  37. 10
  38. 0.25
  39. 3
  40. 0.2

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