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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 59 · 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 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  2. 2.⚡ Which formula gives electric power? (a) P = V + I (b) P = I ÷ V (c) P = V × I (d) P = V ÷ I
  3. 3.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  4. 4.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  5. 5.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  6. 6.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  7. 7.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  8. 8.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  9. 9.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  10. 10.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  11. 11.⚡ Power tells us … (a) the length of a wire (b) the size of a cell (c) the colour of light (d) energy used each second
  12. 12.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  14. 14.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  15. 15.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  18. 18.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  19. 19.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  20. 20.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  23. 23.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  24. 24.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  25. 25.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  26. 26.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
  27. 27.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  28. 28.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  29. 29.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  30. 30.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  31. 31.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  32. 32.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  33. 33.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  34. 34.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  35. 35.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  36. 36.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  38. 38.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  39. 39.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =

Answer key

  1. 0.5
  2. P = V × I
  3. 18
  4. 24
  5. 1.5
  6. 0.1
  7. 2.5
  8. 3
  9. 2300
  10. 3
  11. energy used each second
  12. 36
  13. 2.4
  14. 0.25
  15. 1
  16. 6
  17. 2.25
  18. 345
  19. 1.5
  20. 0.25
  21. 0.3
  22. 3
  23. 1840
  24. 0.6
  25. 1.5
  26. 1
  27. 12
  28. 920
  29. 6
  30. 230
  31. 6
  32. 115
  33. 2
  34. 0.25
  35. 1150
  36. 9
  37. 9
  38. 1.5
  39. 1
  40. 2.25

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