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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 303 · 40 questions
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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 4.5 W device works on 3 V. What current does it take (in amperes)? =
  2. 2.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  3. 3.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  4. 4.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  5. 5.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  6. 6.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  7. 7.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  8. 8.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  9. 9.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  10. 10.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  11. 11.⚡ Which formula gives electric power? (a) P = V × I (b) P = I ÷ V (c) P = V + I (d) P = V ÷ I
  12. 12.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  13. 13.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  14. 14.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  15. 15.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  18. 18.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  19. 19.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  20. 20.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  21. 21.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  22. 22.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  23. 23.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  24. 24.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  25. 25.⚡ Power tells us … (a) the length of a wire (b) energy used each second (c) the colour of light (d) the size of a cell
  26. 26.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  27. 27.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  28. 28.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  29. 29.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  33. 33.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  35. 35.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  36. 36.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  37. 37.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  38. 38.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
  39. 39.⚡ A 36 W device works on 12 V. What current does it take (in amperes)? =
  40. 40.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?

Answer key

  1. 1.5
  2. 2
  3. 0.1
  4. 18
  5. 920
  6. 12
  7. 2.4
  8. 0.6
  9. 345
  10. 1
  11. P = V × I
  12. 3
  13. 0.1
  14. 2
  15. 1.5
  16. 9
  17. 1.8
  18. 230
  19. 0.2
  20. 115
  21. 3
  22. 1150
  23. 0.1
  24. 1.5
  25. energy used each second
  26. 6
  27. 1840
  28. 24
  29. 0.25
  30. 1.5
  31. 36
  32. 1.25
  33. 0.5
  34. 2.4
  35. 0.9
  36. 4.5
  37. 0.5
  38. 0.25
  39. 3
  40. 460

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