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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 16 · 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.🧮 A 0.7 V battery is joined to 4 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  2. 2.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  3. 3.📏 How many kilowatts (kW) is 3500 W? =
  4. 4.🔺 A current of 10 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
  5. 5.📏 How many watts (W) is 1 kW?
  6. 6.True or false: resistance is measured in ohms (Ω). (a) False (b) True
  7. 7.🧮 Three equal 60 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  8. 8.🌈 A resistor has the colour bands blue, white, black. What is its value (in ohms)?
  9. 9.🔺 A current of 40 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
  10. 10.🔺 A current of 2 A flows when 20 V is joined across a resistor. What is its resistance (in ohms)?
  11. 11.🔺 A current of 10 mA flows through a 400 Ω resistor. What is the voltage across it (in volts)? =
  12. 12.🌈 A resistor has the colour bands red, blue, red. What is its value in kilo-ohms (kΩ)? =
  13. 13.🔺 A 12 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
  14. 14.🔺 A current of 0.5 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
  15. 15.🌈 A resistor has the colour bands violet, blue, yellow. What is its value in kilo-ohms (kΩ)? =
  16. 16.🌈 A resistor has the colour bands blue, blue, red. What is its value in kilo-ohms (kΩ)? =
  17. 17.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  18. 18.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) switch off empty rooms (d) unplug idle chargers
  19. 19.⚡ A device works on 3 V and takes 2 A. What is its power (in watts)? =
  20. 20.🔺 A current of 3 A flows when 12 V is joined across a resistor. What is its resistance (in ohms)?
  21. 21.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  22. 22.📏 Voltmeter or ammeter: which one measures voltage? (a) voltmeter (b) ammeter
  23. 23.🌈 A resistor has the colour bands green, orange, orange. What is its value in kilo-ohms (kΩ)? =
  24. 24.What does a buzzer do? (a) makes things spin (b) turns a fan or wheels (c) lets current go one way (d) makes a beeping sound
  25. 25.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  26. 26.📏 How many amperes (A) is 1910 mA? =
  27. 27.📏 In the water-pipe picture of a circuit, current is like … (a) the water pressure (b) a narrow pipe (c) the flow of water (d) the pipe colour
  28. 28.🔺 A current of 3 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
  29. 29.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) stays the same (b) becomes zero (c) gets smaller (d) gets bigger
  30. 30.📏 Voltmeter or ammeter: which one measures current? (a) ammeter (b) voltmeter
  31. 31.🧮 A 4 V battery is joined to 2 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
  32. 32.🔺 A current of 0.25 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
  33. 33.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V × I (c) P = V + I (d) P = V ÷ I
  34. 34.🔺 A current of 3 A flows when 60 V is joined across a resistor. What is its resistance (in ohms)?
  35. 35.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 46 Ω resistor? (a) yellow-blue-black (b) blue-yellow-black (c) green-blue-black (d) yellow-blue-brown
  36. 36.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  37. 37.True or false: the push of a cell is measured in watts (W). (a) True (b) False
  38. 38.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
  39. 39.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
  40. 40.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp

Answer key

  1. 0.1
  2. 440
  3. 3.5
  4. 1.5
  5. 1000
  6. True
  7. 20
  8. 69
  9. 4.8
  10. 10
  11. 4
  12. 2.6
  13. 3
  14. 1
  15. 760
  16. 6.6
  17. 1
  18. leave fridge door open
  19. 6
  20. 4
  21. wastes electricity
  22. voltmeter
  23. 53
  24. makes a beeping sound
  25. 24
  26. 1.91
  27. the flow of water
  28. 12
  29. gets smaller
  30. ammeter
  31. 0.5
  32. 1.5
  33. P = V × I
  34. 20
  35. yellow-blue-black
  36. 0.15
  37. False
  38. anode (+)
  39. cathode (−)
  40. an LED lamp

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