← Part 2 test: components and Ohm’s law lesson New set →

Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 96 · 40 questions
TalentJR

Remember (Find the topic, use the formula): Find the topic and the formula: V = I × R, I = V ÷ R, R = V ÷ I, P = V × I, units = W × h ÷ 1000. Change mA to A and kΩ to Ω before using a formula. Check: put your answer back into the formula.

NameDateTime takenScore ___ / 40
  1. 1.🧮 Four equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  2. 2.True or false: the voltmeter is joined in series. (a) True (b) False
  3. 3.True or false: voltage is measured in volts (V). (a) True (b) False
  4. 4.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  5. 5.Which of these is measured in amperes (A)? (a) current (b) power (c) resistance (d) how much a part resists
  6. 6.🔺 A 1.5 V supply is joined across a 15 Ω resistor. What current flows (in amperes)? =
  7. 7.🔺 A 3 V supply is joined across a 15 Ω resistor. What current flows (in amperes)? =
  8. 8.🔺 A current of 1.5 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  9. 9.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) becomes zero (b) gets smaller (c) gets bigger (d) stays the same
  10. 10.🔺 A current of 2 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
  11. 11.🔺 A 1.25 V supply is joined across a 5 Ω resistor. What current flows (in amperes)? =
  12. 12.🧮 A 15 V battery is joined to 5 Ω and 10 Ω resistors in series. What current flows (in amperes)? =
  13. 13.📏 How many watts (W) is 3.7 kW?
  14. 14.🔺 A current of 25 mA flows when 3.75 V is joined across a resistor. What is its resistance (in ohms)?
  15. 15.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  16. 16.What does a transistor do? (a) turns a fan or wheels (b) boosts a small signal (c) blows if current is high (d) senses how bright it is
  17. 17.🔺 A current of 10 mA flows when 1.5 V is joined across a resistor. What is its resistance (in ohms)?
  18. 18.🔺 An 8.25 V supply is joined across a 330 Ω resistor. What current flows (in milliamperes, mA)?
  19. 19.📏 Which unit measures current? (a) volt (V) (b) ohm (Ω) (c) ampere (A) (d) watt (W)
  20. 20.True or false: to use LED lamps saves electricity. (a) False (b) True
  21. 21.🌈 In the resistor colour code, which number does brown stand for?
  22. 22.💡 On an LED, is the leg by the flat edge the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
  23. 23.🌈 In the resistor colour code, which number does green stand for?
  24. 24.🔺 In the V-I-R triangle, how do we find V? (a) V = I ÷ R (b) V = R ÷ I (c) V = I × R (d) V = I + R
  25. 25.🌈 A gold fourth band on a resistor means the value may be off by … (a) 50 % (b) 5 % (c) 0 % (d) 25 %
  26. 26.📏 Which unit measures energy used each second? (a) ohm (Ω) (b) volt (V) (c) watt (W) (d) ampere (A)
  27. 27.True or false: the ammeter is joined across a part. (a) False (b) True
  28. 28.📏 How many milliamperes (mA) is 2.66 A?
  29. 29.🔺 A current of 25 mA flows through a 200 Ω resistor. What is the voltage across it (in volts)? =
  30. 30.🧮 A 4.5 V battery is joined to 6 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  31. 31.True or false: the voltmeter is joined across a part. (a) True (b) False
  32. 32.🔺 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
  33. 33.🧮 Resistors of 47 Ω and 10 Ω are joined in series. What is the total resistance (in ohms)?
  34. 34.🔺 A current of 0.1 A flows when 0.8 V is joined across a resistor. What is its resistance (in ohms)?
  35. 35.🌈 A resistor has the colour bands orange, yellow, black. What is its value (in ohms)?
  36. 36.Which of these is measured in volts (V)? (a) the push of a cell (b) how much a part resists (c) resistance (d) the flow of charge
  37. 37.🔺 A current of 10 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
  38. 38.🔺 A current of 2.5 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =
  39. 39.🧮 A 50 Ω resistor is joined in series with two equal 470 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  40. 40.True or false: a buzzer makes a beeping sound. (a) True (b) False

Answer key

  1. 25
  2. False
  3. True
  4. 250
  5. current
  6. 0.1
  7. 0.2
  8. 4.5
  9. gets smaller
  10. 16
  11. 0.25
  12. 1
  13. 3700
  14. 150
  15. 460
  16. boosts a small signal
  17. 150
  18. 25
  19. ampere (A)
  20. True
  21. 1
  22. cathode (−)
  23. 5
  24. V = I × R
  25. 5 %
  26. watt (W)
  27. False
  28. 2660
  29. 5
  30. 0.5
  31. True
  32. R = V ÷ I
  33. 57
  34. 8
  35. 34
  36. the push of a cell
  37. 2.5
  38. 50
  39. 285
  40. True

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