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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 48 · 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 1.8 W device works on 9 V. What current does it take (in amperes)? =
  2. 2.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  3. 3.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  4. 4.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  5. 5.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  6. 6.⚡ Which formula gives electric power? (a) P = V + I (b) P = V × I (c) P = V ÷ I (d) P = I ÷ V
  7. 7.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  9. 9.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  10. 10.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  11. 11.⚡ Power tells us … (a) energy used each second (b) the length of a wire (c) the size of a cell (d) the colour of light
  12. 12.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  14. 14.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  15. 15.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  16. 16.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  17. 17.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  20. 20.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  21. 21.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  22. 22.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  23. 23.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  24. 24.⚡ A home appliance on the 230 V mains takes 5 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 home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  27. 27.⚡ A device works on 3 V and takes 2 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 home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  30. 30.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  31. 31.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 6 V and takes 3 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 13.5 W device works on 9 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  37. 37.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  38. 38.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =

Answer key

  1. 0.2
  2. 3
  3. 1.2
  4. 0.9
  5. 0.25
  6. P = V × I
  7. 3
  8. 1840
  9. 2.5
  10. 0.2
  11. energy used each second
  12. 4.5
  13. 36
  14. 12
  15. 345
  16. 48
  17. 1
  18. 12
  19. 27
  20. 1
  21. 230
  22. 6
  23. 1.5
  24. 1150
  25. 0.1
  26. 115
  27. 6
  28. 2
  29. 920
  30. 1.5
  31. 0.5
  32. 0.75
  33. 18
  34. 2300
  35. 1.5
  36. 0.6
  37. 460
  38. 0.1
  39. 3
  40. 0.15

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