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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 384 · 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.Which of these is measured in watts (W)? (a) voltage (b) the push of a cell (c) power (d) current
  2. 2.🔺 A current of 25 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
  3. 3.🔺 A current of 50 mA flows when 15 V is joined across a resistor. What is its resistance (in ohms)?
  4. 4.🧮 Two equal 10 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  5. 5.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  6. 6.⚡ Power tells us … (a) the size of a cell (b) energy used each second (c) the length of a wire (d) the colour of light
  7. 7.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use LED lamps (d) use daylight to read
  8. 8.💡 What does LED stand for? (a) light-emitting diode (b) low energy device (c) large electric dial (d) light energy dial
  9. 9.True or false: the voltmeter is joined in series. (a) False (b) True
  10. 10.🔺 A current of 10 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
  11. 11.🌈 In the resistor colour code, which number does violet stand for?
  12. 12.What does a transistor do? (a) boosts a small signal (b) makes things spin (c) beeps for an alarm (d) stores a little charge
  13. 13.💡 An LED is joined to a 9 V battery through a 220 Ω resistor; its long leg goes to the − side and its short leg to the + side. What happens? (a) may burn out (b) lights up (c) does not light
  14. 14.Which of these wastes electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) unplug idle chargers (d) switch off empty rooms
  15. 15.🔺 A current of 3 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  16. 16.🔺 A 6 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
  17. 17.🔺 A 2 V supply is joined across a 200 Ω resistor. What current flows (in milliamperes, mA)?
  18. 18.📏 Voltmeter or ammeter: which one is joined across a part? (a) ammeter (b) voltmeter
  19. 19.🌈 A gold fourth band on a resistor means the value may be off by … (a) 25 % (b) 5 % (c) 0 % (d) 50 %
  20. 20.🧩 Which part changes electrical energy into sound? (a) a buzzer (b) a capacitor (c) a diode (d) a resistor
  21. 21.📏 How many kilo-ohms (kΩ) is 1500 Ω? =
  22. 22.True or false: a fuse blows if current is high. (a) False (b) True
  23. 23.🔺 A 5.5 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
  24. 24.🧮 Resistors of 20 Ω, 20 Ω, 10 Ω and 150 Ω are joined in series. What is the total resistance (in ohms)?
  25. 25.🧩 Which component makes a beeping sound? (a) fuse (b) motor (c) buzzer (d) diode
  26. 26.🔺 A current of 20 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
  27. 27.🔺 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
  28. 28.🧮 Resistors of 10 Ω, 10 Ω and 68 Ω are joined in series. What is the total resistance (in ohms)?
  29. 29.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 380 Ω resistor? (a) orange-grey-black (b) orange-grey-red (c) orange-grey-brown (d) grey-orange-brown
  30. 30.🔺 A current of 40 mA flows when 4.8 V is joined across a resistor. What is its resistance (in ohms)?
  31. 31.🧮 Two equal 330 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  32. 32.🔺 A 2.5 V supply is joined across a 250 Ω resistor. What current flows (in milliamperes, mA)?
  33. 33.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) set the AC to 24 °C
  34. 34.🔺 A current of 1.5 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  35. 35.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) close the fridge quickly
  36. 36.🔺 In the V-I-R triangle, how do we find R? (a) R = V + I (b) R = V × I (c) R = V ÷ I (d) R = I ÷ V
  37. 37.🌈 A resistor has the colour bands orange, yellow, yellow. What is its value in kilo-ohms (kΩ)? =
  38. 38.🌈 A resistor has the colour bands yellow, red, red. What is its value in kilo-ohms (kΩ)? =
  39. 39.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) use LED lamps
  40. 40.🔺 A current of 40 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =

Answer key

  1. power
  2. 3
  3. 300
  4. 5
  5. 950
  6. energy used each second
  7. leave the TV on standby
  8. light-emitting diode
  9. False
  10. 1.2
  11. 7
  12. boosts a small signal
  13. does not light
  14. iron one shirt at a time
  15. 9
  16. 1.5
  17. 10
  18. voltmeter
  19. 5 %
  20. a buzzer
  21. 1.5
  22. True
  23. 25
  24. 200
  25. buzzer
  26. 5
  27. V = I × R
  28. 88
  29. orange-grey-brown
  30. 120
  31. 165
  32. 10
  33. set the AC to 24 °C
  34. 4.5
  35. close the fridge quickly
  36. R = V ÷ I
  37. 340
  38. 4.2
  39. leave the TV on standby
  40. 4.8

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