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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 999 · 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 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  2. 2.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  3. 3.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  4. 4.⚡ A device works on 3 V and takes 2 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.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V × I (d) P = V + I
  7. 7.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  8. 8.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
  9. 9.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  12. 12.⚡ Power tells us … (a) the colour of light (b) the length of a wire (c) the size of a cell (d) energy used each second
  13. 13.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 4 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 0.1 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  18. 18.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  20. 20.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  23. 23.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  24. 24.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  25. 25.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  26. 26.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  27. 27.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  28. 28.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  30. 30.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  31. 31.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  32. 32.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  34. 34.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  35. 35.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  36. 36.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  37. 37.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  38. 38.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  39. 39.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =

Answer key

  1. 0.25
  2. 2.4
  3. 345
  4. 6
  5. 3
  6. P = V × I
  7. 460
  8. 1.5
  9. 18
  10. 0.3
  11. 230
  12. energy used each second
  13. 0.1
  14. 920
  15. 1150
  16. 0.5
  17. 0.6
  18. 1.5
  19. 1.2
  20. 0.1
  21. 2.25
  22. 1.5
  23. 0.2
  24. 0.2
  25. 115
  26. 0.3
  27. 0.25
  28. 3
  29. 0.75
  30. 0.2
  31. 1.2
  32. 0.1
  33. 1
  34. 1
  35. 2
  36. 1840
  37. 0.1
  38. 2300
  39. 4.8
  40. 4.5

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