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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 756 · 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 0.1 A. What is its power (in watts)? =
  2. 2.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  3. 3.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
  4. 4.⚡ 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
  5. 5.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  6. 6.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  7. 7.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  9. 9.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  10. 10.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  11. 11.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  14. 14.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  15. 15.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  18. 18.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  19. 19.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  20. 20.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  21. 21.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  22. 22.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  23. 23.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  24. 24.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  25. 25.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  27. 27.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V × I (c) P = I ÷ V (d) P = V + I
  28. 28.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  33. 33.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  34. 34.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  35. 35.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  37. 37.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  38. 38.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  39. 39.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  40. 40.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =

Answer key

  1. 1.2
  2. 1.5
  3. 1
  4. energy used each second
  5. 115
  6. 0.6
  7. 10
  8. 230
  9. 0.2
  10. 0.1
  11. 0.25
  12. 18
  13. 2.4
  14. 2.25
  15. 0.5
  16. 1.8
  17. 27
  18. 3
  19. 1.5
  20. 1840
  21. 0.2
  22. 0.1
  23. 920
  24. 3
  25. 0.1
  26. 0.6
  27. P = V × I
  28. 6
  29. 1.25
  30. 15
  31. 3
  32. 0.5
  33. 3
  34. 1.5
  35. 3
  36. 9
  37. 345
  38. 1150
  39. 5
  40. 0.5

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