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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 770 · 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 0.5 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 1.8 W device works on 9 V. What current does it take (in amperes)? =
  4. 4.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  5. 5.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  6. 6.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  7. 7.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  8. 8.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  9. 9.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  12. 12.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  14. 14.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  15. 15.⚡ 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
  16. 16.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  17. 17.⚡ A 1.2 W device works on 12 V. What current does it take (in amperes)? =
  18. 18.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 24 V and takes 0.25 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 device works on 12 V and takes 2 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  25. 25.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  26. 26.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  27. 27.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  28. 28.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  29. 29.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  30. 30.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  31. 31.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  32. 32.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  33. 33.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  34. 34.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  35. 35.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  37. 37.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  38. 38.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  39. 39.⚡ A 48 W device works on 24 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =

Answer key

  1. 4.5
  2. P = V × I
  3. 0.2
  4. 230
  5. 115
  6. 0.1
  7. 2.4
  8. 0.6
  9. 0.375
  10. 4.5
  11. 1150
  12. 0.25
  13. 460
  14. 2.25
  15. energy used each second
  16. 2300
  17. 0.1
  18. 0.25
  19. 6
  20. 0.25
  21. 24
  22. 0.15
  23. 24
  24. 0.3
  25. 0.1
  26. 1840
  27. 1.5
  28. 0.5
  29. 3
  30. 0.5
  31. 345
  32. 920
  33. 3
  34. 0.9
  35. 0.5
  36. 2.5
  37. 1.5
  38. 0.25
  39. 2
  40. 48

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