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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 560 · 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 24 V and takes 0.1 A. What is its power (in watts)? =
  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) the length of a wire (b) the colour of light (c) the size of a cell (d) energy used each second
  4. 4.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  5. 5.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  7. 7.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  9. 9.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  10. 10.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  12. 12.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  13. 13.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  14. 14.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  15. 15.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  16. 16.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  18. 18.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  20. 20.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  21. 21.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  22. 22.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  23. 23.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  24. 24.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
  25. 25.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  26. 26.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  27. 27.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  28. 28.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  30. 30.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  31. 31.⚡ A 12 W device works on 24 V. What current does it take (in amperes)? =
  32. 32.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  34. 34.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  35. 35.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  36. 36.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  37. 37.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  38. 38.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
  40. 40.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =

Answer key

  1. 2.4
  2. P = V × I
  3. energy used each second
  4. 0.1
  5. 2.25
  6. 230
  7. 18
  8. 115
  9. 48
  10. 1.5
  11. 2300
  12. 1.5
  13. 0.25
  14. 12
  15. 1.5
  16. 12
  17. 0.3
  18. 0.2
  19. 9
  20. 10
  21. 460
  22. 1150
  23. 0.375
  24. 2
  25. 0.75
  26. 3
  27. 345
  28. 4.5
  29. 4.5
  30. 1
  31. 0.5
  32. 0.2
  33. 6
  34. 0.3
  35. 920
  36. 2
  37. 1.5
  38. 1.5
  39. 1.5
  40. 3

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