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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 274 · 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 device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  2. 2.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  3. 3.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  4. 4.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  5. 5.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  6. 6.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  7. 7.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 1.5 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 home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  11. 11.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  12. 12.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  13. 13.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  15. 15.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V × I (c) P = V ÷ I (d) P = V + I
  16. 16.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  17. 17.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  18. 18.⚡ Power tells us … (a) the colour of light (b) the size of a cell (c) energy used each second (d) the length of a wire
  19. 19.⚡ A 12 W device works on 12 V. What current does it take (in amperes)? =
  20. 20.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  23. 23.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  24. 24.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  25. 25.⚡ A 36 W device works on 12 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  27. 27.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  28. 28.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  34. 34.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  35. 35.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 1.5 V and takes 3 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 6 W device works on 24 V. What current does it take (in amperes)? =

Answer key

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

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