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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 46 · 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 1.5 V and takes 0.25 A. What is its power (in watts)? =
  2. 2.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V × I (d) P = V + I
  3. 3.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  4. 4.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  5. 5.⚡ Power tells us … (a) the size of a cell (b) the length of a wire (c) the colour of light (d) energy used each second
  6. 6.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  7. 7.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  8. 8.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  9. 9.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  10. 10.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  11. 11.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  12. 12.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  13. 13.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  14. 14.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  15. 15.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  16. 16.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  18. 18.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  19. 19.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  20. 20.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  24. 24.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  25. 25.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  28. 28.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
  29. 29.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  30. 30.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  31. 31.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  33. 33.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  34. 34.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  35. 35.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  36. 36.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  37. 37.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
  38. 38.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  39. 39.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  40. 40.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =

Answer key

  1. 0.375
  2. P = V × I
  3. 460
  4. 2300
  5. energy used each second
  6. 345
  7. 0.6
  8. 1.5
  9. 0.5
  10. 6
  11. 3
  12. 0.25
  13. 2
  14. 36
  15. 0.6
  16. 1.5
  17. 4.8
  18. 3
  19. 1840
  20. 0.1
  21. 1.25
  22. 24
  23. 13.5
  24. 1
  25. 0.2
  26. 0.75
  27. 12
  28. 1
  29. 3
  30. 0.2
  31. 0.5
  32. 0.3
  33. 1150
  34. 1
  35. 0.1
  36. 920
  37. 1.5
  38. 1.5
  39. 0.25
  40. 0.2

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