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Electronics Worksheet: Ohm’s Law – Current and Resistance

Electronics lesson 13: Ohm’s law: find current and resistance · Set 86 · 40 questions
TalentJR

Remember (Cover what you want): I = V ÷ R (amperes = volts ÷ ohms). R = V ÷ I (ohms = volts ÷ amperes); use amperes, not mA, in the formula. Example: 5 V and 25 mA (0.025 A) → R = 5 ÷ 0.025 = 200 Ω.

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  1. 1.🔺 A current of 0.2 A flows when 0.6 V is joined across a resistor. What is its resistance (in ohms)?
  2. 2.🔺 A 5 V supply is joined across a 100 Ω resistor. What current flows (in milliamperes, mA)?
  3. 3.🔺 A 0.3 V supply is joined across a 3 Ω resistor. What current flows (in amperes)? =
  4. 4.🔺 A current of 10 mA flows when 1.5 V is joined across a resistor. What is its resistance (in ohms)?
  5. 5.🔺 A current of 0.2 A flows when 0.8 V is joined across a resistor. What is its resistance (in ohms)?
  6. 6.🔺 A current of 10 mA flows when 1.2 V is joined across a resistor. What is its resistance (in ohms)?
  7. 7.🔺 A current of 2.5 A flows when 7.5 V is joined across a resistor. What is its resistance (in ohms)?
  8. 8.🔺 A current of 0.1 A flows when 0.3 V is joined across a resistor. What is its resistance (in ohms)?
  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.🔺 In the V-I-R triangle, how do we find I? (a) I = V ÷ R (b) I = R ÷ V (c) I = V + R (d) I = V × R
  11. 11.🔺 A 5.5 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
  12. 12.🔺 A current of 0.1 A flows when 1 V is joined across a resistor. What is its resistance (in ohms)?
  13. 13.🔺 A 12.5 V supply is joined across a 250 Ω resistor. What current flows (in milliamperes, mA)?
  14. 14.🔺 A current of 0.25 A flows when 2 V is joined across a resistor. What is its resistance (in ohms)?
  15. 15.🔺 A 12 V supply is joined across an 8 Ω resistor. What current flows (in amperes)? =
  16. 16.🔺 A current of 2 A flows when 12 V is joined across a resistor. What is its resistance (in ohms)?
  17. 17.🔺 A current of 40 mA flows when 8 V is joined across a resistor. What is its resistance (in ohms)?
  18. 18.🔺 A current of 0.5 A flows when 2 V is joined across a resistor. What is its resistance (in ohms)?
  19. 19.🔺 A current of 20 mA flows when 8 V is joined across a resistor. What is its resistance (in ohms)?
  20. 20.🔺 A current of 40 mA flows when 8.8 V is joined across a resistor. What is its resistance (in ohms)?
  21. 21.🔺 A 2 V supply is joined across an 8 Ω resistor. What current flows (in amperes)? =
  22. 22.🔺 A current of 40 mA flows when 4.8 V is joined across a resistor. What is its resistance (in ohms)?
  23. 23.🔺 A current of 20 mA flows when 4.4 V is joined across a resistor. What is its resistance (in ohms)?
  24. 24.🔺 A 15 V supply is joined across a 10 Ω resistor. What current flows (in amperes)? =
  25. 25.🔺 A current of 10 mA flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
  26. 26.🔺 A 4 V supply is joined across a 400 Ω resistor. What current flows (in milliamperes, mA)?
  27. 27.🔺 A 13.2 V supply is joined across a 330 Ω resistor. What current flows (in milliamperes, mA)?
  28. 28.🔺 A current of 0.1 A flows when 1.5 V is joined across a resistor. What is its resistance (in ohms)?
  29. 29.🔺 A current of 1 A flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
  30. 30.🔺 A 3.75 V supply is joined across a 150 Ω resistor. What current flows (in milliamperes, mA)?
  31. 31.🔺 A 2.5 V supply is joined across a 10 Ω resistor. What current flows (in amperes)? =
  32. 32.🔺 A current of 40 mA flows when 13.2 V is joined across a resistor. What is its resistance (in ohms)?
  33. 33.🔺 A current of 20 mA flows when 9.4 V is joined across a resistor. What is its resistance (in ohms)?
  34. 34.🔺 An 18.8 V supply is joined across a 470 Ω resistor. What current flows (in milliamperes, mA)?
  35. 35.🔺 A 0.6 V supply is joined across a 6 Ω resistor. What current flows (in amperes)? =
  36. 36.🔺 A current of 1 A flows when 5 V is joined across a resistor. What is its resistance (in ohms)?
  37. 37.🔺 A current of 50 mA flows when 16.5 V is joined across a resistor. What is its resistance (in ohms)?
  38. 38.🔺 A 4.7 V supply is joined across a 470 Ω resistor. What current flows (in milliamperes, mA)?
  39. 39.🔺 A current of 2.5 A flows when 25 V is joined across a resistor. What is its resistance (in ohms)?
  40. 40.🔺 A current of 40 mA flows when 16 V is joined across a resistor. What is its resistance (in ohms)?

Answer key

  1. 3
  2. 50
  3. 0.1
  4. 150
  5. 4
  6. 120
  7. 3
  8. 3
  9. V = I × R
  10. I = V ÷ R
  11. 25
  12. 10
  13. 50
  14. 8
  15. 1.5
  16. 6
  17. 200
  18. 4
  19. 400
  20. 220
  21. 0.25
  22. 120
  23. 220
  24. 1.5
  25. 300
  26. 10
  27. 40
  28. 15
  29. 3
  30. 25
  31. 0.25
  32. 330
  33. 470
  34. 40
  35. 0.1
  36. 5
  37. 330
  38. 10
  39. 10
  40. 400

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