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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 843 · 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.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V × I (d) P = V + I
  2. 2.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  3. 3.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  4. 4.⚡ Power tells us … (a) the length of a wire (b) the size of a cell (c) the colour of light (d) energy used each second
  5. 5.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  6. 6.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  7. 7.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  8. 8.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  9. 9.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  10. 10.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  12. 12.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  13. 13.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  14. 14.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  15. 15.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  16. 16.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  17. 17.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  19. 19.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  20. 20.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  21. 21.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  22. 22.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  24. 24.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  25. 25.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  27. 27.⚡ An 18 W device works on 6 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  29. 29.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  32. 32.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  33. 33.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  34. 34.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  35. 35.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  36. 36.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  39. 39.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  40. 40.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =

Answer key

  1. P = V × I
  2. 115
  3. 0.375
  4. energy used each second
  5. 230
  6. 0.3
  7. 0.75
  8. 0.25
  9. 0.25
  10. 4.5
  11. 2300
  12. 4.5
  13. 1.5
  14. 18
  15. 0.25
  16. 1150
  17. 2
  18. 0.6
  19. 1
  20. 4.8
  21. 1.5
  22. 1.5
  23. 9
  24. 1840
  25. 0.2
  26. 2.4
  27. 3
  28. 2.4
  29. 3
  30. 24
  31. 4.5
  32. 460
  33. 9
  34. 920
  35. 3
  36. 1.5
  37. 36
  38. 13.5
  39. 0.1
  40. 2

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