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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 890 · 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 device works on 24 V and takes 1.5 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.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  4. 4.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  5. 5.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  6. 6.⚡ Power tells us … (a) energy used each second (b) the length of a wire (c) the colour of light (d) the size of a cell
  7. 7.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = I ÷ V (c) P = V × I (d) P = V + I
  8. 8.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  9. 9.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  10. 10.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  11. 11.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  13. 13.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  15. 15.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  16. 16.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  18. 18.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  19. 19.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  20. 20.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  21. 21.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  22. 22.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  23. 23.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  25. 25.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  27. 27.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  29. 29.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  30. 30.⚡ A device works on 12 V and takes 3 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 device works on 6 V and takes 2 A. What is its power (in watts)? =
  33. 33.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  34. 34.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  35. 35.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  36. 36.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  39. 39.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  40. 40.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =

Answer key

  1. 36
  2. 1840
  3. 2.5
  4. 9
  5. 0.5
  6. energy used each second
  7. P = V × I
  8. 0.5
  9. 6
  10. 115
  11. 1
  12. 24
  13. 1.5
  14. 920
  15. 1.5
  16. 1.5
  17. 2.25
  18. 15
  19. 1.5
  20. 0.75
  21. 3
  22. 460
  23. 1.25
  24. 0.15
  25. 2
  26. 72
  27. 0.5
  28. 3
  29. 1150
  30. 36
  31. 0.1
  32. 12
  33. 2300
  34. 48
  35. 0.1
  36. 2
  37. 4.5
  38. 4.8
  39. 230
  40. 5

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