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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 92 · 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 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  2. 2.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  3. 3.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V + I (c) P = V ÷ I (d) P = V × I
  4. 4.⚡ Power tells us … (a) the size of a cell (b) energy used each second (c) the colour of light (d) the length of a wire
  5. 5.⚡ An 18 W device works on 6 V. What current does it take (in amperes)? =
  6. 6.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  7. 7.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  9. 9.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  10. 10.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  11. 11.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  14. 14.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  15. 15.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  16. 16.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  17. 17.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  18. 18.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  20. 20.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  22. 22.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  24. 24.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  25. 25.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  27. 27.⚡ A 48 W device works on 24 V. What current does it take (in amperes)? =
  28. 28.⚡ A 72 W device works on 24 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 3 W device works on 6 V. What current does it take (in amperes)? =
  32. 32.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  33. 33.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  34. 34.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  35. 35.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  36. 36.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  38. 38.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  39. 39.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  40. 40.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =

Answer key

  1. 0.25
  2. 0.1
  3. P = V × I
  4. energy used each second
  5. 3
  6. 1
  7. 0.1
  8. 115
  9. 0.25
  10. 1.5
  11. 0.2
  12. 36
  13. 345
  14. 0.9
  15. 0.5
  16. 1.2
  17. 0.5
  18. 0.1
  19. 2.25
  20. 0.25
  21. 36
  22. 0.1
  23. 1.2
  24. 2300
  25. 0.1
  26. 15
  27. 2
  28. 3
  29. 6
  30. 24
  31. 0.5
  32. 0.5
  33. 920
  34. 9
  35. 0.2
  36. 3
  37. 0.15
  38. 0.1
  39. 230
  40. 1.25

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