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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 36 · 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 9 V and takes 3 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.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  4. 4.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  5. 5.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  6. 6.⚡ Power tells us … (a) the length of a wire (b) the size of a cell (c) energy used each second (d) the colour of light
  7. 7.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  8. 8.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  9. 9.⚡ A 4.8 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 10 A. What is its power (in watts)?
  12. 12.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
  13. 13.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  14. 14.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  15. 15.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  16. 16.⚡ A 12 W device works on 24 V. What current does it take (in amperes)? =
  17. 17.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  18. 18.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  19. 19.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  20. 20.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  21. 21.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  22. 22.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  23. 23.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  24. 24.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  25. 25.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  26. 26.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  27. 27.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  28. 28.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  30. 30.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  31. 31.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  33. 33.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  34. 34.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  35. 35.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  36. 36.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  39. 39.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  40. 40.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =

Answer key

  1. 27
  2. P = V × I
  3. 6
  4. 1840
  5. 0.1
  6. energy used each second
  7. 230
  8. 48
  9. 0.2
  10. 18
  11. 2300
  12. 0.25
  13. 3
  14. 3
  15. 0.1
  16. 0.5
  17. 115
  18. 920
  19. 1150
  20. 13.5
  21. 2
  22. 0.2
  23. 1
  24. 0.3
  25. 1.5
  26. 460
  27. 18
  28. 2
  29. 2.25
  30. 1
  31. 36
  32. 0.6
  33. 345
  34. 6
  35. 4.5
  36. 6
  37. 1.8
  38. 2.25
  39. 7.5
  40. 0.2

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