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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 310 · 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.

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  1. 1.🔺 An 18 V supply is joined across a 12 Ω resistor. What current flows (in amperes)? =
  2. 2.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) stays the same (b) gets smaller (c) gets bigger (d) becomes zero
  3. 3.Which of these is measured in volts (V)? (a) power (b) the push of a cell (c) the flow of charge (d) resistance
  4. 4.🔺 A current of 0.1 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
  5. 5.📏 Voltmeter or ammeter: which one measures voltage? (a) voltmeter (b) ammeter
  6. 6.🔺 A current of 0.2 A flows when 1 V is joined across a resistor. What is its resistance (in ohms)?
  7. 7.📏 How many ohms make 1 kilo-ohm (kΩ)? (a) 1000 (b) 100 (c) 10 (d) 1024
  8. 8.🧩 Which part changes electrical energy into movement? (a) an LED (b) a motor (c) a resistor (d) a fuse
  9. 9.🔺 A current of 2.5 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
  10. 10.True or false: the voltmeter is joined across a part. (a) False (b) True
  11. 11.🔺 In the V-I-R triangle, how do we find V? (a) V = I ÷ R (b) V = I + R (c) V = I × R (d) V = R ÷ I
  12. 12.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
  13. 13.🧮 Resistors of 68 Ω, 150 Ω and 330 Ω are joined in series. What is the total resistance (in ohms)?
  14. 14.🔺 A current of 2.5 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
  15. 15.True or false: a motor makes things spin. (a) True (b) False
  16. 16.🔺 A current of 0.2 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =
  17. 17.📏 Voltmeter or ammeter: which one measures current? (a) voltmeter (b) ammeter
  18. 18.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  19. 19.📏 How many milliamperes (mA) is 2.08 A?
  20. 20.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) leave fridge door open
  21. 21.🧮 Resistors of 22 Ω, 10 Ω, 68 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
  22. 22.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  23. 23.🔺 A current of 2 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
  24. 24.🧮 A 0.9 V battery is joined to 6 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  25. 25.True or false: the push of a cell is measured in ohms (Ω). (a) False (b) True
  26. 26.True or false: the voltmeter measures current. (a) False (b) True
  27. 27.True or false: on an LED, the shorter leg is the cathode (−). (a) True (b) False
  28. 28.🔺 A current of 40 mA flows when 8 V is joined across a resistor. What is its resistance (in ohms)?
  29. 29.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  30. 30.🔺 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
  31. 31.🔺 A current of 1 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =
  32. 32.True or false: a potentiometer is a resistance knob. (a) False (b) True
  33. 33.🧮 Two resistors in parallel give a total that is … (a) more than either one (b) less than either one (c) always zero (d) their sum
  34. 34.🔺 A current of 50 mA flows when 10 V is joined across a resistor. What is its resistance (in ohms)?
  35. 35.🧩 Which part changes electrical energy into sound? (a) a diode (b) a capacitor (c) a buzzer (d) a resistor
  36. 36.🔺 A current of 0.5 A flows when 2.5 V is joined across a resistor. What is its resistance (in ohms)?
  37. 37.🧮 A 33 Ω resistor is joined in series with two equal 20 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  38. 38.🧩 Which component boosts a small signal? (a) capacitor (b) motor (c) buzzer (d) transistor
  39. 39.💡 On an LED, is the leg by the flat edge the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
  40. 40.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?

Answer key

  1. 1.5
  2. gets smaller
  3. the push of a cell
  4. 1
  5. voltmeter
  6. 5
  7. 1000
  8. a motor
  9. 37.5
  10. True
  11. V = I × R
  12. anode (+)
  13. 548
  14. 20
  15. True
  16. 4
  17. ammeter
  18. 680
  19. 2080
  20. leave fridge door open
  21. 133
  22. False
  23. 30
  24. 0.1
  25. False
  26. False
  27. True
  28. 200
  29. 48
  30. R = V ÷ I
  31. 20
  32. True
  33. less than either one
  34. 200
  35. a buzzer
  36. 5
  37. 43
  38. transistor
  39. cathode (−)
  40. 10

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