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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 23 · 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 home appliance on the 230 V mains takes 1 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 1.5 A. What is its power (in watts)?
  4. 4.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
  5. 5.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  6. 6.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  7. 7.⚡ Power tells us … (a) the length of a wire (b) energy used each second (c) the size of a cell (d) the colour of light
  8. 8.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  9. 9.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  10. 10.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  11. 11.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  12. 12.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  13. 13.⚡ A home appliance on the 230 V mains takes 10 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 device works on 5 V and takes 2 A. What is its power (in watts)? =
  16. 16.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  17. 17.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  18. 18.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  20. 20.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  21. 21.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  22. 22.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  23. 23.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  26. 26.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  27. 27.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  29. 29.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  30. 30.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  31. 31.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  32. 32.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  33. 33.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 9 V and takes 3 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 home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  37. 37.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  38. 38.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  39. 39.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  40. 40.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =

Answer key

  1. 230
  2. P = V × I
  3. 345
  4. 1
  5. 0.25
  6. 4.8
  7. energy used each second
  8. 920
  9. 0.2
  10. 9
  11. 1.25
  12. 1150
  13. 2300
  14. 1840
  15. 10
  16. 0.1
  17. 0.1
  18. 0.2
  19. 4.5
  20. 36
  21. 0.1
  22. 115
  23. 18
  24. 24
  25. 2.25
  26. 0.2
  27. 12
  28. 2.5
  29. 0.5
  30. 1.5
  31. 6
  32. 1
  33. 0.1
  34. 27
  35. 1.5
  36. 460
  37. 0.25
  38. 0.5
  39. 0.5
  40. 3

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