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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 726 · 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 4 A. What is its power (in watts)?
  2. 2.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  3. 3.⚡ Power tells us … (a) the size of a cell (b) the colour of light (c) energy used each second (d) the length of a wire
  4. 4.⚡ Which formula gives electric power? (a) P = V + I (b) P = V × I (c) P = I ÷ V (d) P = V ÷ I
  5. 5.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  7. 7.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  8. 8.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  9. 9.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  10. 10.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  11. 11.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  12. 12.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  14. 14.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  15. 15.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  16. 16.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  18. 18.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  20. 20.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  21. 21.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  22. 22.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  26. 26.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  30. 30.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  31. 31.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  32. 32.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
  34. 34.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  35. 35.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  36. 36.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  38. 38.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  39. 39.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  40. 40.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =

Answer key

  1. 920
  2. 345
  3. energy used each second
  4. P = V × I
  5. 1
  6. 1840
  7. 0.1
  8. 2.25
  9. 0.1
  10. 460
  11. 4.5
  12. 0.75
  13. 0.6
  14. 18
  15. 115
  16. 0.5
  17. 0.15
  18. 10
  19. 2.4
  20. 0.75
  21. 2300
  22. 0.25
  23. 2.5
  24. 3
  25. 72
  26. 18
  27. 12
  28. 1.8
  29. 1.5
  30. 0.2
  31. 0.5
  32. 0.5
  33. 1.5
  34. 230
  35. 12
  36. 0.3
  37. 6
  38. 0.1
  39. 1150
  40. 1.5

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