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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 119 · 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.🔺 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
  2. 2.⚡ Which formula gives electric power? (a) P = V × I (b) P = V + I (c) P = V ÷ I (d) P = I ÷ V
  3. 3.🔺 A current of 1 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
  4. 4.🧩 A capacitor in a circuit can … (a) spin a wheel (b) measure heat (c) store charge briefly (d) make light
  5. 5.🌈 A resistor has the colour bands white, red, orange. What is its value in kilo-ohms (kΩ)? =
  6. 6.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
  7. 7.🔺 A 3 V supply is joined across a 12 Ω resistor. What current flows (in amperes)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  9. 9.🔺 A current of 1.5 A flows when 6 V is joined across a resistor. What is its resistance (in ohms)?
  10. 10.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  11. 11.🧮 A 14 V battery is joined to 12 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
  12. 12.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a diode (c) a buzzer (d) a capacitor
  13. 13.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  14. 14.🔺 A current of 0.5 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =
  15. 15.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
  16. 16.🌈 A gold fourth band on a resistor means the value may be off by … (a) 50 % (b) 0 % (c) 25 % (d) 5 %
  17. 17.What does a diode do? (a) makes things spin (b) turns a fan or wheels (c) lets current go one way (d) stores a little charge
  18. 18.🔺 A 20 V supply is joined across a 500 Ω resistor. What current flows (in milliamperes, mA)?
  19. 19.🔺 A 20 V supply is joined across a 10 Ω resistor. What current flows (in amperes)? =
  20. 20.True or false: current is measured in amperes (A). (a) False (b) True
  21. 21.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  22. 22.True or false: how much a part resists is measured in volts (V). (a) False (b) True
  23. 23.🔺 A 10 V supply is joined across a 5 Ω resistor. What current flows (in amperes)? =
  24. 24.🧮 Two equal 40 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  25. 25.🔺 A current of 1 A flows when 12 V is joined across a resistor. What is its resistance (in ohms)?
  26. 26.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) use old filament bulbs (d) close the fridge quickly
  27. 27.🔺 A current of 20 mA flows when 4 V is joined across a resistor. What is its resistance (in ohms)?
  28. 28.🔺 A current of 10 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
  29. 29.🔺 A current of 0.25 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
  30. 30.📏 Which unit measures voltage? (a) ohm (Ω) (b) watt (W) (c) ampere (A) (d) volt (V)
  31. 31.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  32. 32.True or false: a resistor has coloured bands. (a) False (b) True
  33. 33.🔺 An 8 V supply is joined across a 200 Ω resistor. What current flows (in milliamperes, mA)?
  34. 34.📏 Voltmeter or ammeter: which one measures voltage? (a) voltmeter (b) ammeter
  35. 35.Which of these is measured in ohms (Ω)? (a) the push of a cell (b) resistance (c) current (d) energy used each second
  36. 36.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  37. 37.📏 How many kilowatts (kW) is 5000 W? =
  38. 38.🔺 A current of 1 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
  39. 39.🔺 A current of 10 mA flows through a 400 Ω resistor. What is the voltage across it (in volts)? =
  40. 40.🔺 A current of 0.5 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =

Answer key

  1. V = I × R
  2. P = V × I
  3. 6
  4. store charge briefly
  5. 92
  6. an LED lamp
  7. 0.25
  8. 1840
  9. 4
  10. 510
  11. 1
  12. a buzzer
  13. 3
  14. 10
  15. switch off empty rooms
  16. 5 %
  17. lets current go one way
  18. 40
  19. 2
  20. True
  21. 0.1
  22. False
  23. 2
  24. 20
  25. 12
  26. use old filament bulbs
  27. 200
  28. 3.3
  29. 1
  30. volt (V)
  31. 960
  32. True
  33. 40
  34. voltmeter
  35. resistance
  36. 3
  37. 5
  38. 2
  39. 4
  40. 1.5

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