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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 116 · 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 = V ÷ I (b) P = V + I (c) P = V × I (d) P = I ÷ V
  2. 2.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  3. 3.⚡ Power tells us … (a) energy used each second (b) the colour of light (c) the length of a wire (d) the size of a cell
  4. 4.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  5. 5.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  7. 7.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  8. 8.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  9. 9.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  10. 10.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  11. 11.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  12. 12.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  13. 13.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  15. 15.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  17. 17.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  18. 18.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  19. 19.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  20. 20.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  21. 21.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  22. 22.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  24. 24.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  25. 25.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  27. 27.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  29. 29.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  32. 32.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  33. 33.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  35. 35.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  36. 36.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  37. 37.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  39. 39.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =

Answer key

  1. P = V × I
  2. 0.5
  3. energy used each second
  4. 2
  5. 24
  6. 115
  7. 72
  8. 2.25
  9. 345
  10. 0.2
  11. 1.25
  12. 2300
  13. 4.8
  14. 460
  15. 1.5
  16. 0.3
  17. 230
  18. 0.3
  19. 1.5
  20. 2.4
  21. 1840
  22. 1
  23. 18
  24. 2
  25. 1
  26. 7.5
  27. 0.5
  28. 3
  29. 0.25
  30. 1.2
  31. 12
  32. 0.2
  33. 0.2
  34. 4.5
  35. 0.25
  36. 920
  37. 3
  38. 1.2
  39. 0.5
  40. 0.375

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