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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 152 · 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 13.5 W device works on 9 V. What current does it take (in amperes)? =
  2. 2.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  3. 3.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  4. 4.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  5. 5.⚡ Which formula gives electric power? (a) P = V + I (b) P = I ÷ V (c) P = V ÷ I (d) P = V × I
  6. 6.⚡ A home appliance on the 230 V mains 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 1.25 W device works on 5 V. What current does it take (in amperes)? =
  9. 9.⚡ 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
  10. 10.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  11. 11.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  12. 12.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  13. 13.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  14. 14.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  15. 15.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  17. 17.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  18. 18.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  19. 19.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  20. 20.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  21. 21.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  22. 22.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  23. 23.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  24. 24.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  25. 25.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  28. 28.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  29. 29.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  32. 32.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  34. 34.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  35. 35.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  37. 37.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  38. 38.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =

Answer key

  1. 1.5
  2. 1840
  3. 3
  4. 1.2
  5. P = V × I
  6. 115
  7. 2.4
  8. 0.25
  9. energy used each second
  10. 2300
  11. 6
  12. 72
  13. 1.5
  14. 1.5
  15. 0.1
  16. 4.5
  17. 1150
  18. 3
  19. 460
  20. 7.5
  21. 1
  22. 230
  23. 1.2
  24. 1.5
  25. 1
  26. 0.375
  27. 0.75
  28. 920
  29. 48
  30. 12
  31. 3
  32. 0.1
  33. 36
  34. 345
  35. 2
  36. 10
  37. 0.2
  38. 0.2
  39. 24
  40. 1.5

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