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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 891 · 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 9 W device works on 6 V. What current does it take (in amperes)? =
  2. 2.⚡ Which formula gives electric power? (a) P = V × I (b) P = V ÷ I (c) P = V + I (d) P = I ÷ V
  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 home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  5. 5.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  6. 6.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  7. 7.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  8. 8.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  9. 9.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  10. 10.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  11. 11.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  13. 13.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  14. 14.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  15. 15.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  16. 16.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  17. 17.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  20. 20.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  21. 21.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  22. 22.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  24. 24.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  25. 25.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  26. 26.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  27. 27.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  28. 28.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  29. 29.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  31. 31.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  32. 32.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
  33. 33.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  35. 35.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  36. 36.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  37. 37.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  38. 38.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  39. 39.⚡ A 12 W device works on 24 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =

Answer key

  1. 1.5
  2. P = V × I
  3. energy used each second
  4. 345
  5. 1
  6. 1
  7. 12
  8. 1.25
  9. 1150
  10. 0.3
  11. 0.2
  12. 18
  13. 0.25
  14. 7.5
  15. 460
  16. 230
  17. 3
  18. 10
  19. 36
  20. 0.3
  21. 18
  22. 1.5
  23. 0.6
  24. 115
  25. 920
  26. 0.2
  27. 0.5
  28. 1840
  29. 1.5
  30. 2.25
  31. 0.2
  32. 0.25
  33. 0.1
  34. 36
  35. 1.5
  36. 2300
  37. 0.5
  38. 24
  39. 0.5
  40. 18

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