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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 961 · 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 home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  2. 2.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  3. 3.⚡ Power tells us … (a) the colour of light (b) the size of a cell (c) the length of a wire (d) energy used each second
  4. 4.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  5. 5.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  6. 6.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  7. 7.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  8. 8.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  9. 9.⚡ Which formula gives electric power? (a) P = V × I (b) P = V + I (c) P = V ÷ I (d) P = I ÷ V
  10. 10.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  11. 11.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  14. 14.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  15. 15.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  16. 16.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  17. 17.⚡ A 36 W device works on 12 V. What current does it take (in amperes)? =
  18. 18.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  20. 20.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  21. 21.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  26. 26.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
  27. 27.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  28. 28.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  29. 29.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  31. 31.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  34. 34.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  35. 35.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  36. 36.⚡ A 12 W device works on 12 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  39. 39.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =

Answer key

  1. 115
  2. 1840
  3. energy used each second
  4. 920
  5. 0.6
  6. 0.2
  7. 0.3
  8. 0.9
  9. P = V × I
  10. 2300
  11. 0.25
  12. 1.8
  13. 0.75
  14. 3
  15. 36
  16. 230
  17. 3
  18. 0.2
  19. 12
  20. 345
  21. 24
  22. 10
  23. 1.5
  24. 0.3
  25. 1.5
  26. 0.25
  27. 460
  28. 1150
  29. 1.5
  30. 15
  31. 0.2
  32. 1.25
  33. 48
  34. 18
  35. 0.5
  36. 1
  37. 6
  38. 18
  39. 0.5
  40. 3

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