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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 638 · 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 home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  2. 2.⚡ 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
  3. 3.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  4. 4.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  5. 5.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = I ÷ V (d) P = V × I
  6. 6.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  7. 7.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  8. 8.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  9. 9.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  11. 11.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  12. 12.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  15. 15.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  16. 16.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  17. 17.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  18. 18.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  19. 19.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  20. 20.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
  21. 21.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  22. 22.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  23. 23.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  24. 24.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  25. 25.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  26. 26.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  27. 27.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  28. 28.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  29. 29.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  30. 30.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  31. 31.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  33. 33.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  34. 34.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  35. 35.⚡ A 48 W device works on 24 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  37. 37.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  38. 38.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  39. 39.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  40. 40.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =

Answer key

  1. 1840
  2. energy used each second
  3. 18
  4. 0.5
  5. P = V × I
  6. 2.4
  7. 9
  8. 2.25
  9. 24
  10. 0.75
  11. 0.9
  12. 1.25
  13. 5
  14. 460
  15. 7.5
  16. 1.8
  17. 230
  18. 920
  19. 27
  20. 1
  21. 115
  22. 6
  23. 1
  24. 10
  25. 3
  26. 0.2
  27. 345
  28. 0.5
  29. 1150
  30. 24
  31. 0.2
  32. 0.3
  33. 0.5
  34. 2
  35. 2
  36. 1
  37. 2300
  38. 0.2
  39. 0.2
  40. 2

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