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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 585 · 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 = V × I (c) P = V ÷ I (d) P = I ÷ V
  2. 2.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  3. 3.⚡ Power tells us … (a) the colour of light (b) the size of a cell (c) the length of a wire (d) energy used each second
  4. 4.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  5. 5.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  7. 7.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  9. 9.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  10. 10.⚡ A device works on 1.5 V and takes 0.25 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 13.5 W device works on 9 V. What current does it take (in amperes)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  14. 14.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  15. 15.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  16. 16.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  17. 17.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  18. 18.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  20. 20.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  21. 21.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  23. 23.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  24. 24.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  26. 26.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  28. 28.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  29. 29.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  31. 31.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  32. 32.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  34. 34.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  35. 35.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  37. 37.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  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 0.2 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =

Answer key

  1. P = V × I
  2. 345
  3. energy used each second
  4. 920
  5. 0.5
  6. 1150
  7. 1.5
  8. 115
  9. 460
  10. 0.375
  11. 2300
  12. 1.5
  13. 230
  14. 1840
  15. 13.5
  16. 1.5
  17. 3
  18. 0.1
  19. 0.3
  20. 1.2
  21. 1.8
  22. 1.25
  23. 0.2
  24. 72
  25. 12
  26. 3
  27. 0.3
  28. 0.1
  29. 0.25
  30. 0.9
  31. 1.5
  32. 1
  33. 0.15
  34. 2
  35. 1
  36. 12
  37. 1.5
  38. 9
  39. 1.2
  40. 4.5

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