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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 604 · 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.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 740 Ω resistor? (a) violet-yellow-red (b) yellow-violet-brown (c) violet-yellow-brown (d) violet-yellow-black
  2. 2.🧮 Two equal 220 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  3. 3.🧮 A 220 Ω resistor is joined in series with two equal 330 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  4. 4.🔺 In the V-I-R triangle, how do we find R? (a) R = I ÷ V (b) R = V ÷ I (c) R = V × I (d) R = V + I
  5. 5.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  6. 6.🧩 Which part changes electrical energy into movement? (a) a motor (b) a fuse (c) a resistor (d) an LED
  7. 7.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
  8. 8.🧮 Two equal 470 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  9. 9.True or false: a thermistor senses how hot it is. (a) False (b) True
  10. 10.🧮 Resistors of 22 Ω and 330 Ω are joined in series. What is the total resistance (in ohms)?
  11. 11.True or false: a resistor limits the current. (a) True (b) False
  12. 12.🌈 A resistor has the colour bands violet, grey, orange. What is its value in kilo-ohms (kΩ)? =
  13. 13.True or false: the flow of charge is measured in watts (W). (a) False (b) True
  14. 14.🔺 A 1 V supply is joined across a 100 Ω resistor. What current flows (in milliamperes, mA)?
  15. 15.💡 A red LED (it uses 2 V) is joined with a 100 Ω resistor to a 2.5 V supply. What current flows (in mA)?
  16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  17. 17.🧮 A 9 V battery is joined to 3 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
  18. 18.🔺 A current of 3 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
  19. 19.🌈 A resistor has the colour bands brown, yellow, orange. What is its value (in ohms)?
  20. 20.🔺 A current of 25 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
  21. 21.🌈 In the resistor colour code, which number does brown stand for?
  22. 22.🌈 A gold fourth band on a resistor means the value may be off by … (a) 5 % (b) 50 % (c) 25 % (d) 0 %
  23. 23.🧩 A capacitor in a circuit can … (a) measure heat (b) spin a wheel (c) make light (d) store charge briefly
  24. 24.📏 In the water-pipe picture of a circuit, resistance is like … (a) a bigger tank (b) the water pressure (c) the flow of water (d) a narrow pipe
  25. 25.📏 Which unit measures current? (a) watt (W) (b) volt (V) (c) ampere (A) (d) ohm (Ω)
  26. 26.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  27. 27.True or false: voltage is measured in watts (W). (a) False (b) True
  28. 28.🧮 Adding another resistor in series makes the total resistance … (a) zero (b) smaller (c) stay the same (d) bigger
  29. 29.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 140 Ω resistor? (a) brown-yellow-brown (b) yellow-brown-brown (c) brown-yellow-black (d) brown-yellow-red
  30. 30.💡 What does LED stand for? (a) light energy dial (b) light-emitting diode (c) large electric dial (d) low energy device
  31. 31.🧮 Four equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  32. 32.🔺 A current of 1.5 A flows when 22.5 V is joined across a resistor. What is its resistance (in ohms)?
  33. 33.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  34. 34.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
  35. 35.🧮 Two equal 330 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  36. 36.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) unplug idle chargers (d) use daylight to read
  37. 37.True or false: the ammeter measures voltage. (a) False (b) True
  38. 38.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 5300 Ω resistor? (a) orange-green-red (b) green-orange-orange (c) green-orange-brown (d) green-orange-red
  39. 39.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) unplug idle chargers (d) close the fridge quickly
  40. 40.⚡ A 12 W device works on 12 V. What current does it take (in amperes)? =

Answer key

  1. violet-yellow-brown
  2. 110
  3. 385
  4. R = V ÷ I
  5. 560
  6. a motor
  7. 1 kilowatt-hour (kWh)
  8. 235
  9. True
  10. 352
  11. True
  12. 78
  13. False
  14. 10
  15. 5
  16. wastes electricity
  17. 1
  18. 45
  19. 14000
  20. 3.75
  21. 1
  22. 5 %
  23. store charge briefly
  24. a narrow pipe
  25. ampere (A)
  26. 0.15
  27. False
  28. bigger
  29. brown-yellow-brown
  30. light-emitting diode
  31. 25
  32. 15
  33. 200
  34. iron one shirt at a time
  35. 165
  36. leave fridge door open
  37. False
  38. green-orange-red
  39. use old filament bulbs
  40. 1

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