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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 94 · 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 1.5 W device works on 6 V. What current does it take (in amperes)? =
  3. 3.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  4. 4.⚡ 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
  5. 5.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  6. 6.⚡ Which formula gives electric power? (a) P = V × I (b) P = I ÷ V (c) P = V + I (d) P = V ÷ I
  7. 7.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  8. 8.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  9. 9.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  10. 10.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  11. 11.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  12. 12.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  13. 13.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  14. 14.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  15. 15.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  16. 16.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  18. 18.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  20. 20.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  21. 21.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  22. 22.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  23. 23.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  24. 24.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  26. 26.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  27. 27.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  28. 28.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  31. 31.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  32. 32.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  33. 33.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  35. 35.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  36. 36.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  37. 37.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  39. 39.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  40. 40.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =

Answer key

  1. 1.5
  2. 0.25
  3. 345
  4. energy used each second
  5. 1
  6. P = V × I
  7. 920
  8. 3
  9. 2
  10. 0.15
  11. 3
  12. 1840
  13. 5
  14. 9
  15. 0.2
  16. 1.5
  17. 48
  18. 0.25
  19. 4.5
  20. 3
  21. 115
  22. 2300
  23. 2
  24. 1.5
  25. 24
  26. 2.4
  27. 460
  28. 3
  29. 0.375
  30. 0.75
  31. 0.1
  32. 0.1
  33. 1
  34. 0.9
  35. 0.5
  36. 230
  37. 1.2
  38. 24
  39. 1.2
  40. 0.2

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