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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 684 · 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 amperes (A)? (a) power (b) how much a part resists (c) the flow of charge (d) voltage
  2. 2.🔺 An 18.8 V supply is joined across a 470 Ω resistor. What current flows (in milliamperes, mA)?
  3. 3.🔺 A current of 1 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
  4. 4.🔺 A 20 V supply is joined across a 20 Ω resistor. What current flows (in amperes)? =
  5. 5.🔺 A current of 0.5 A flows when 2 V is joined across a resistor. What is its resistance (in ohms)?
  6. 6.True or false: a diode lets current go one way. (a) False (b) True
  7. 7.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  8. 8.🔺 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
  9. 9.💡 An LED is joined to a 3 V battery through a 330 Ω resistor; the leg next to the flat edge of its rim goes to the − side. What happens? (a) does not light (b) may burn out (c) lights up
  10. 10.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  11. 11.Which of these is measured in volts (V)? (a) resistance (b) energy used each second (c) voltage (d) how much a part resists
  12. 12.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  13. 13.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  14. 14.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 630 Ω resistor? (a) blue-orange-red (b) blue-orange-black (c) orange-blue-brown (d) blue-orange-brown
  15. 15.True or false: on an LED, the leg by the flat edge is the cathode (−). (a) False (b) True
  16. 16.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) becomes zero (b) stays the same (c) gets smaller (d) gets bigger
  17. 17.🧮 Two equal 330 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  18. 18.🌈 In the resistor colour code, which number does yellow stand for?
  19. 19.🧮 A 100 Ω resistor is joined in series with two equal 40 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  20. 20.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 59 Ω resistor? (a) blue-white-black (b) white-green-black (c) green-white-brown (d) green-white-black
  21. 21.💡 An LED is joined to a 9 V battery through a 470 Ω resistor; its long leg goes to the + side and its short leg to the − side. What happens? (a) lights up (b) may burn out (c) does not light
  22. 22.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  23. 23.💡 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) does not light (b) lights up (c) may burn out
  24. 24.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) zero (c) bigger (d) smaller
  25. 25.True or false: the ammeter is joined across a part. (a) True (b) False
  26. 26.🧮 Resistors of 68 Ω, 50 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
  27. 27.⚡ Power tells us … (a) the length of a wire (b) energy used each second (c) the size of a cell (d) the colour of light
  28. 28.💡 On an LED, is the leg by the flat edge the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
  29. 29.🔺 A current of 50 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
  30. 30.📏 Voltmeter or ammeter: which one is joined in series? (a) voltmeter (b) ammeter
  31. 31.🌈 A resistor has the colour bands red, red, brown. What is its value (in ohms)?
  32. 32.🔺 A current of 3 A flows when 60 V is joined across a resistor. What is its resistance (in ohms)?
  33. 33.🧮 Two equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  34. 34.📏 How many milliamperes (mA) make 1 ampere? (a) 10 (b) 60 (c) 1000 (d) 100
  35. 35.🧮 Resistors of 100 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
  36. 36.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  37. 37.What does a buzzer do? (a) stores a little charge (b) lets current go one way (c) beeps for an alarm (d) limits the current
  38. 38.🔺 A 1.25 V supply is joined across a 5 Ω resistor. What current flows (in amperes)? =
  39. 39.🌈 Which band is read first on a resistor? (a) any band (b) the one nearest an end (c) the gold band (d) the widest gap
  40. 40.True or false: a thermistor senses how hot it is. (a) True (b) False

Answer key

  1. the flow of charge
  2. 40
  3. 12
  4. 1
  5. 4
  6. True
  7. 800
  8. V = I × R
  9. lights up
  10. 0.5
  11. voltage
  12. 2300
  13. False
  14. blue-orange-brown
  15. True
  16. gets smaller
  17. 165
  18. 4
  19. 120
  20. green-white-black
  21. lights up
  22. 10
  23. lights up
  24. bigger
  25. False
  26. 151
  27. energy used each second
  28. cathode (−)
  29. 12.5
  30. ammeter
  31. 220
  32. 20
  33. 100
  34. 1000
  35. 147
  36. 3
  37. beeps for an alarm
  38. 0.25
  39. the one nearest an end
  40. True

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