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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 323 · 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 5 V and takes 0.2 A. What is its power (in watts)? =
  2. 2.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  3. 3.⚡ Power tells us … (a) the colour of light (b) the length of a wire (c) the size of a cell (d) energy used each second
  4. 4.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  5. 5.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V × I (d) P = V + I
  6. 6.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  7. 7.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  8. 8.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  9. 9.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  10. 10.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  11. 11.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  15. 15.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  16. 16.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  18. 18.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  19. 19.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  20. 20.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  21. 21.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  22. 22.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  24. 24.⚡ A 48 W device works on 24 V. What current does it take (in amperes)? =
  25. 25.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  26. 26.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  27. 27.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  29. 29.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  30. 30.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  32. 32.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  33. 33.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  34. 34.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  35. 35.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 9 V and takes 3 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 1 W device works on 5 V. What current does it take (in amperes)? =
  40. 40.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =

Answer key

  1. 1
  2. 230
  3. energy used each second
  4. 0.75
  5. P = V × I
  6. 1
  7. 1
  8. 1.5
  9. 0.5
  10. 1
  11. 1
  12. 36
  13. 72
  14. 920
  15. 0.3
  16. 2
  17. 4.5
  18. 0.9
  19. 2300
  20. 3
  21. 1840
  22. 0.1
  23. 36
  24. 2
  25. 3
  26. 0.1
  27. 24
  28. 6
  29. 460
  30. 0.75
  31. 6
  32. 0.5
  33. 345
  34. 2.25
  35. 0.25
  36. 3
  37. 27
  38. 2.4
  39. 0.2
  40. 0.2

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