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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 245 · 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 2 A. What is its power (in watts)?
  2. 2.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  3. 3.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  4. 4.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  5. 5.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  6. 6.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  7. 7.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  9. 9.⚡ Power tells us … (a) the length of a wire (b) the colour of light (c) the size of a cell (d) energy used each second
  10. 10.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  12. 12.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  13. 13.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  14. 14.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  15. 15.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  16. 16.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  17. 17.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  18. 18.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  19. 19.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  20. 20.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  21. 21.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  22. 22.⚡ Which formula gives electric power? (a) P = V × I (b) P = I ÷ V (c) P = V + I (d) P = V ÷ I
  23. 23.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  24. 24.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  25. 25.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  26. 26.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  29. 29.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  30. 30.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  31. 31.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  32. 32.⚡ A 48 W device works on 24 V. What current does it take (in amperes)? =
  33. 33.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  35. 35.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  36. 36.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  37. 37.⚡ An 18 W device works on 6 V. What current does it take (in amperes)? =
  38. 38.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  39. 39.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =

Answer key

  1. 460
  2. 6
  3. 4.5
  4. 6
  5. 48
  6. 0.5
  7. 1.25
  8. 2300
  9. energy used each second
  10. 6
  11. 920
  12. 0.5
  13. 0.2
  14. 0.2
  15. 27
  16. 1.5
  17. 0.25
  18. 1
  19. 0.1
  20. 1840
  21. 230
  22. P = V × I
  23. 4.8
  24. 0.25
  25. 1
  26. 3
  27. 0.6
  28. 12
  29. 345
  30. 6
  31. 0.1
  32. 2
  33. 0.5
  34. 15
  35. 1150
  36. 72
  37. 3
  38. 115
  39. 3
  40. 18

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