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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 867 · 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 1 A. What is its power (in watts)? =
  2. 2.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  3. 3.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  4. 4.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  5. 5.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  6. 6.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = I ÷ V (d) P = V × I
  7. 7.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  8. 8.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  9. 9.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  10. 10.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  11. 11.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  12. 12.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  15. 15.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  16. 16.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  18. 18.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  19. 19.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  20. 20.⚡ Power tells us … (a) the colour of light (b) energy used each second (c) the size of a cell (d) the length of a wire
  21. 21.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  22. 22.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
  23. 23.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  24. 24.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  25. 25.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  28. 28.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  29. 29.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  31. 31.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  32. 32.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  33. 33.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  34. 34.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  35. 35.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  36. 36.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  37. 37.⚡ An 18 W device works on 6 V. What current does it take (in amperes)? =
  38. 38.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  39. 39.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =

Answer key

  1. 9
  2. 230
  3. 36
  4. 0.2
  5. 2300
  6. P = V × I
  7. 920
  8. 1.5
  9. 345
  10. 18
  11. 1.8
  12. 4.5
  13. 27
  14. 1840
  15. 1150
  16. 10
  17. 13.5
  18. 0.1
  19. 0.2
  20. energy used each second
  21. 6
  22. 0.25
  23. 0.2
  24. 1.5
  25. 0.5
  26. 0.9
  27. 1.5
  28. 1.5
  29. 1
  30. 0.75
  31. 115
  32. 1.2
  33. 2
  34. 0.1
  35. 3
  36. 0.5
  37. 3
  38. 0.375
  39. 1
  40. 0.3

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