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Electronics Worksheet: Ohm’s Law – Find the Voltage

Electronics lesson 12: Ohm’s law: find the voltage · Set 16 · 40 questions
TalentJR

Remember (V on top): V = I × R (volts = amperes × ohms). Change mA to A first: 20 mA = 0.02 A. Example: 0.02 A × 220 Ω = 4.4 V.

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  1. 1.🔺 In the V-I-R triangle, how do we find R? (a) R = V × I (b) R = I ÷ V (c) R = V ÷ I (d) R = V + I
  2. 2.🔺 A current of 50 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
  3. 3.🔺 A current of 0.1 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
  4. 4.🔺 A current of 0.2 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  5. 5.🔺 A current of 0.25 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
  6. 6.🔺 A current of 25 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
  7. 7.🔺 A current of 25 mA flows through a 400 Ω resistor. What is the voltage across it (in volts)? =
  8. 8.🔺 A current of 50 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
  9. 9.🔺 In the V-I-R triangle, how do we find V? (a) V = R ÷ I (b) V = I × R (c) V = I ÷ R (d) V = I + R
  10. 10.🔺 A current of 1 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
  11. 11.🔺 In the V-I-R triangle, how do we find I? (a) I = R ÷ V (b) I = V + R (c) I = V ÷ R (d) I = V × R
  12. 12.🔺 A current of 0.5 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
  13. 13.🔺 A current of 3 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  14. 14.🔺 A current of 10 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
  15. 15.🔺 A current of 20 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
  16. 16.🔺 A current of 1 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
  17. 17.🔺 A current of 40 mA flows through a 220 Ω resistor. What is the voltage across it (in volts)? =
  18. 18.🔺 A current of 40 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
  19. 19.🔺 A current of 0.5 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
  20. 20.🔺 A current of 2.5 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
  21. 21.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets smaller (b) becomes zero (c) stays the same (d) gets bigger
  22. 22.🔺 A current of 0.25 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
  23. 23.🔺 A current of 1 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
  24. 24.🔺 A current of 10 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
  25. 25.🔺 A current of 20 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
  26. 26.🔺 A current of 25 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
  27. 27.🔺 A current of 50 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
  28. 28.🔺 A current of 2 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
  29. 29.🔺 A current of 40 mA flows through a 200 Ω resistor. What is the voltage across it (in volts)? =
  30. 30.🔺 A current of 25 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
  31. 31.🔺 A current of 1.5 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  32. 32.🔺 A current of 2 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
  33. 33.🔺 A current of 10 mA flows through a 200 Ω resistor. What is the voltage across it (in volts)? =
  34. 34.🔺 A current of 2.5 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
  35. 35.🔺 A current of 0.1 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
  36. 36.🔺 A current of 40 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
  37. 37.🔺 A current of 2.5 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
  38. 38.🔺 A current of 50 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
  39. 39.🔺 A current of 0.2 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
  40. 40.🔺 A current of 0.2 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =

Answer key

  1. R = V ÷ I
  2. 5
  3. 0.2
  4. 0.6
  5. 2
  6. 2.5
  7. 10
  8. 15
  9. V = I × R
  10. 2
  11. I = V ÷ R
  12. 7.5
  13. 9
  14. 4.7
  15. 9.4
  16. 15
  17. 8.8
  18. 12
  19. 6
  20. 25
  21. gets smaller
  22. 1
  23. 6
  24. 1
  25. 6.6
  26. 11.75
  27. 7.5
  28. 30
  29. 8
  30. 3.75
  31. 4.5
  32. 24
  33. 2
  34. 5
  35. 0.4
  36. 4
  37. 20
  38. 6
  39. 0.8
  40. 0.4

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