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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 981 · 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 = I ÷ V (c) P = V + I (d) P = V × I
  2. 2.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  3. 3.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  4. 4.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  5. 5.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  7. 7.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  8. 8.⚡ 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
  9. 9.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
  10. 10.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  12. 12.⚡ A 12 W device works on 24 V. What current does it take (in amperes)? =
  13. 13.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  14. 14.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  15. 15.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  16. 16.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  17. 17.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  18. 18.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  19. 19.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  20. 20.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  21. 21.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  22. 22.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  24. 24.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  25. 25.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  27. 27.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  28. 28.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  31. 31.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  32. 32.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  34. 34.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  35. 35.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  36. 36.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  38. 38.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  39. 39.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  40. 40.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =

Answer key

  1. P = V × I
  2. 920
  3. 36
  4. 18
  5. 1.5
  6. 460
  7. 115
  8. energy used each second
  9. 0.25
  10. 18
  11. 230
  12. 0.5
  13. 0.375
  14. 36
  15. 1150
  16. 0.25
  17. 1
  18. 0.2
  19. 345
  20. 6
  21. 3
  22. 1.5
  23. 24
  24. 0.5
  25. 2
  26. 3
  27. 1840
  28. 0.9
  29. 5
  30. 7.5
  31. 0.5
  32. 3
  33. 13.5
  34. 0.5
  35. 1
  36. 0.1
  37. 1.2
  38. 0.25
  39. 2
  40. 2

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