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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 310 · 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 6 V and takes 3 A. What is its power (in watts)? =
  2. 2.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  3. 3.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  4. 4.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  5. 5.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  7. 7.⚡ Which formula gives electric power? (a) P = V + I (b) P = V × I (c) P = V ÷ I (d) P = I ÷ V
  8. 8.⚡ Power tells us … (a) the size of a cell (b) the colour of light (c) energy used each second (d) the length of a wire
  9. 9.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  11. 11.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  12. 12.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  13. 13.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  14. 14.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  15. 15.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  16. 16.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  18. 18.⚡ A device works on 24 V and takes 0.1 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 0.75 W device works on 3 V. What current does it take (in amperes)? =
  21. 21.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  22. 22.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  23. 23.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  24. 24.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  25. 25.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  27. 27.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  28. 28.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  29. 29.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  30. 30.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  31. 31.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  33. 33.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  35. 35.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  36. 36.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  37. 37.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  38. 38.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  40. 40.⚡ A 48 W device works on 24 V. What current does it take (in amperes)? =

Answer key

  1. 18
  2. 0.2
  3. 0.75
  4. 230
  5. 3
  6. 115
  7. P = V × I
  8. energy used each second
  9. 1.8
  10. 0.9
  11. 0.75
  12. 0.3
  13. 1.5
  14. 24
  15. 1.2
  16. 0.2
  17. 18
  18. 2.4
  19. 1840
  20. 0.25
  21. 1.5
  22. 460
  23. 1150
  24. 0.6
  25. 0.25
  26. 15
  27. 1.5
  28. 0.5
  29. 1
  30. 2300
  31. 2.25
  32. 12
  33. 0.25
  34. 24
  35. 9
  36. 3
  37. 1
  38. 1
  39. 36
  40. 2

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