← Ohm’s law: find current and resistance lesson New set →

Electronics Worksheet: Ohm’s Law – Current and Resistance

Electronics lesson 13: Ohm’s law: find current and resistance · Set 794 · 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.

NameDateTime takenScore ___ / 40
  1. 1.🔺 In the V-I-R triangle, how do we find V? (a) V = I ÷ R (b) V = I × R (c) V = R ÷ I (d) V = I + R
  2. 2.🔺 A 6 V supply is joined across a 120 Ω resistor. What current flows (in milliamperes, mA)?
  3. 3.🔺 A 22.5 V supply is joined across a 15 Ω resistor. What current flows (in amperes)? =
  4. 4.🔺 A current of 10 mA flows when 2.2 V is joined across a resistor. What is its resistance (in ohms)?
  5. 5.🔺 A current of 25 mA flows when 2.5 V is joined across a resistor. What is its resistance (in ohms)?
  6. 6.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets smaller (b) stays the same (c) becomes zero (d) gets bigger
  7. 7.🔺 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
  8. 8.🔺 A 0.75 V supply is joined across a 3 Ω resistor. What current flows (in amperes)? =
  9. 9.🔺 A current of 0.1 A flows when 1.2 V is joined across a resistor. What is its resistance (in ohms)?
  10. 10.🔺 A 3 V supply is joined across a 150 Ω resistor. What current flows (in milliamperes, mA)?
  11. 11.🔺 A 16.5 V supply is joined across a 330 Ω resistor. What current flows (in milliamperes, mA)?
  12. 12.🔺 A 2.4 V supply is joined across a 120 Ω resistor. What current flows (in milliamperes, mA)?
  13. 13.🔺 A current of 20 mA flows when 10 V is joined across a resistor. What is its resistance (in ohms)?
  14. 14.🔺 In the V-I-R triangle, how do we find R? (a) R = V × I (b) R = V ÷ I (c) R = I ÷ V (d) R = V + I
  15. 15.🔺 A 1.2 V supply is joined across a 6 Ω resistor. What current flows (in amperes)? =
  16. 16.🔺 A 12 V supply is joined across a 300 Ω resistor. What current flows (in milliamperes, mA)?
  17. 17.🔺 A current of 3 A flows when 18 V is joined across a resistor. What is its resistance (in ohms)?
  18. 18.🔺 A current of 0.5 A flows when 10 V is joined across a resistor. What is its resistance (in ohms)?
  19. 19.🔺 A 6 V supply is joined across a 150 Ω resistor. What current flows (in milliamperes, mA)?
  20. 20.🔺 A 15 V supply is joined across a 300 Ω resistor. What current flows (in milliamperes, mA)?
  21. 21.🔺 A current of 0.25 A flows when 3.75 V is joined across a resistor. What is its resistance (in ohms)?
  22. 22.🔺 A current of 50 mA flows when 15 V is joined across a resistor. What is its resistance (in ohms)?
  23. 23.🔺 A 1.5 V supply is joined across a 3 Ω resistor. What current flows (in amperes)? =
  24. 24.🔺 A 7.5 V supply is joined across a 300 Ω resistor. What current flows (in milliamperes, mA)?
  25. 25.🔺 A current of 10 mA flows when 1 V is joined across a resistor. What is its resistance (in ohms)?
  26. 26.🔺 A 36 V supply is joined across a 12 Ω resistor. What current flows (in amperes)? =
  27. 27.🔺 A current of 0.2 A flows when 1 V is joined across a resistor. What is its resistance (in ohms)?
  28. 28.🔺 A current of 0.2 A flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
  29. 29.🔺 A current of 20 mA flows when 6 V is joined across a resistor. What is its resistance (in ohms)?
  30. 30.🔺 A 1.5 V supply is joined across a 150 Ω resistor. What current flows (in milliamperes, mA)?
  31. 31.🔺 A 15 V supply is joined across a 10 Ω resistor. What current flows (in amperes)? =
  32. 32.🔺 A current of 50 mA flows when 10 V is joined across a resistor. What is its resistance (in ohms)?
  33. 33.🔺 A 1 V supply is joined across a 100 Ω resistor. What current flows (in milliamperes, mA)?
  34. 34.🔺 A current of 20 mA flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
  35. 35.🔺 A 2 V supply is joined across a 20 Ω resistor. What current flows (in amperes)? =
  36. 36.🔺 A 3 V supply is joined across a 120 Ω resistor. What current flows (in milliamperes, mA)?
  37. 37.🔺 A current of 40 mA flows when 10 V is joined across a resistor. What is its resistance (in ohms)?
  38. 38.🔺 A current of 50 mA flows when 7.5 V is joined across a resistor. What is its resistance (in ohms)?
  39. 39.🔺 A 0.6 V supply is joined across a 3 Ω resistor. What current flows (in amperes)? =
  40. 40.🔺 A 16 V supply is joined across a 400 Ω resistor. What current flows (in milliamperes, mA)?

Answer key

  1. V = I × R
  2. 50
  3. 1.5
  4. 220
  5. 100
  6. gets smaller
  7. I = V ÷ R
  8. 0.25
  9. 12
  10. 20
  11. 50
  12. 20
  13. 500
  14. R = V ÷ I
  15. 0.2
  16. 40
  17. 6
  18. 20
  19. 40
  20. 50
  21. 15
  22. 300
  23. 0.5
  24. 25
  25. 100
  26. 3
  27. 5
  28. 15
  29. 300
  30. 10
  31. 1.5
  32. 200
  33. 10
  34. 150
  35. 0.1
  36. 25
  37. 250
  38. 150
  39. 0.2
  40. 40

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids