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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 641 · 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 9 W device works on 9 V. What current does it take (in amperes)? =
  2. 2.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  3. 3.⚡ A 36 W device works on 12 V. What current does it take (in amperes)? =
  4. 4.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  5. 5.⚡ An 18 W device works on 6 V. What current does it take (in amperes)? =
  6. 6.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  7. 7.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = I ÷ V (c) P = V × I (d) P = V + I
  8. 8.⚡ Power tells us … (a) energy used each second (b) the colour of light (c) the length of a wire (d) the size of a cell
  9. 9.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  10. 10.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  11. 11.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  12. 12.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  14. 14.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  15. 15.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  16. 16.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  17. 17.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  20. 20.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  21. 21.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  22. 22.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  26. 26.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  28. 28.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  29. 29.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  30. 30.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  31. 31.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  33. 33.⚡ A 1 W device works on 5 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 24 V and takes 0.5 A. What is its power (in watts)? =
  36. 36.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  39. 39.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =

Answer key

  1. 1
  2. 0.6
  3. 3
  4. 0.75
  5. 3
  6. 10
  7. P = V × I
  8. energy used each second
  9. 115
  10. 2300
  11. 1150
  12. 18
  13. 6
  14. 0.15
  15. 1840
  16. 0.5
  17. 0.25
  18. 48
  19. 15
  20. 460
  21. 920
  22. 1.5
  23. 12
  24. 27
  25. 3
  26. 0.9
  27. 24
  28. 230
  29. 0.25
  30. 0.25
  31. 0.1
  32. 3
  33. 0.2
  34. 0.5
  35. 12
  36. 0.2
  37. 9
  38. 4.8
  39. 2
  40. 2.4

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