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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 183 · 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 10 A. What is its power (in watts)?
  2. 2.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = I ÷ V (d) P = V × I
  3. 3.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  4. 4.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  5. 5.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  6. 6.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  7. 7.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  8. 8.⚡ A 4.5 W device works on 9 V. What current does it take (in amperes)? =
  9. 9.⚡ Power tells us … (a) energy used each second (b) the size of a cell (c) the length of a wire (d) the colour of light
  10. 10.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  11. 11.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  12. 12.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  13. 13.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  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 9 V and takes 0.5 A. What is its power (in watts)? =
  16. 16.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  18. 18.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  19. 19.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  20. 20.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  21. 21.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  22. 22.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  23. 23.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  25. 25.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  27. 27.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  28. 28.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  30. 30.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  31. 31.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  32. 32.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  33. 33.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  34. 34.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  35. 35.⚡ A device works on 24 V and takes 0.1 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 12 V and takes 0.1 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  39. 39.⚡ A device works on 24 V and takes 0.5 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. 2300
  2. P = V × I
  3. 0.9
  4. 0.25
  5. 230
  6. 2
  7. 4.5
  8. 0.5
  9. energy used each second
  10. 0.15
  11. 36
  12. 920
  13. 0.5
  14. 1840
  15. 4.5
  16. 0.2
  17. 2.4
  18. 0.5
  19. 460
  20. 0.25
  21. 1.5
  22. 345
  23. 13.5
  24. 9
  25. 0.25
  26. 0.6
  27. 1150
  28. 0.2
  29. 18
  30. 115
  31. 0.1
  32. 1.5
  33. 1.5
  34. 1.5
  35. 2.4
  36. 9
  37. 1.2
  38. 0.6
  39. 12
  40. 2

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