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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 213 · 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 = I ÷ V (b) P = V × I (c) P = V + I (d) P = V ÷ I
  2. 2.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  3. 3.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  4. 4.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  5. 5.⚡ Power tells us … (a) energy used each second (b) the length of a wire (c) the size of a cell (d) the colour of light
  6. 6.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  7. 7.⚡ A 12 W device works on 12 V. What current does it take (in amperes)? =
  8. 8.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  9. 9.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  10. 10.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  11. 11.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  14. 14.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  15. 15.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  16. 16.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  17. 17.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  18. 18.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  19. 19.⚡ A 36 W device works on 12 V. What current does it take (in amperes)? =
  20. 20.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  21. 21.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  22. 22.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  23. 23.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  24. 24.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  25. 25.⚡ An 18 W device works on 6 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  27. 27.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 1.5 V and takes 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 0.9 W device works on 9 V. What current does it take (in amperes)? =
  33. 33.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  34. 34.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  35. 35.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  36. 36.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  39. 39.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  40. 40.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =

Answer key

  1. P = V × I
  2. 0.5
  3. 460
  4. 0.1
  5. energy used each second
  6. 1.5
  7. 1
  8. 0.25
  9. 115
  10. 3
  11. 0.2
  12. 3
  13. 230
  14. 0.2
  15. 18
  16. 920
  17. 12
  18. 2
  19. 3
  20. 1.5
  21. 0.1
  22. 6
  23. 0.2
  24. 0.2
  25. 3
  26. 12
  27. 1.5
  28. 4.8
  29. 13.5
  30. 1.5
  31. 1.5
  32. 0.1
  33. 0.2
  34. 1.5
  35. 9
  36. 1.5
  37. 0.375
  38. 2.4
  39. 1150
  40. 24

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