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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 707 · 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) the flow of charge (b) voltage (c) how much a part resists (d) resistance
  2. 2.💡 A red LED uses 2 V and should get 10 mA. It runs from a 5 V supply. What resistor (in ohms) is needed in series?
  3. 3.True or false: the voltmeter measures current. (a) False (b) True
  4. 4.🔺 A current of 10 mA flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
  5. 5.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
  6. 6.🔺 In the V-I-R triangle, how do we find I? (a) I = R ÷ V (b) I = V ÷ R (c) I = V × R (d) I = V + R
  7. 7.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
  8. 8.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  9. 9.🔺 A current of 10 mA flows when 2.5 V is joined across a resistor. What is its resistance (in ohms)?
  10. 10.📏 How many milliamperes (mA) is 2.53 A?
  11. 11.True or false: a potentiometer makes a beeping sound. (a) False (b) True
  12. 12.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  13. 13.🧩 Which part changes electrical energy into sound? (a) a diode (b) a capacitor (c) a resistor (d) a buzzer
  14. 14.📏 How many kilo-ohms (kΩ) is 800 Ω? =
  15. 15.💡 On an LED, is the leg by the flat edge the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
  16. 16.🧮 Four equal 400 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  17. 17.🧩 Which component beeps for an alarm? (a) LED (b) diode (c) motor (d) buzzer
  18. 18.🌈 A resistor has the colour bands brown, yellow, red. What is its value in kilo-ohms (kΩ)? =
  19. 19.⚡ Which formula gives electric power? (a) P = V × I (b) P = V ÷ I (c) P = I ÷ V (d) P = V + I
  20. 20.🧮 A 1.2 V battery is joined to 6 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
  21. 21.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  22. 22.🔺 In the V-I-R triangle, how do we find V? (a) V = R ÷ I (b) V = I × R (c) V = I + R (d) V = I ÷ R
  23. 23.🧩 Which part changes electrical energy into movement? (a) a motor (b) an LED (c) a resistor (d) a fuse
  24. 24.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 69 Ω resistor? (a) violet-white-black (b) white-blue-black (c) blue-white-black (d) blue-white-brown
  25. 25.True or false: a fuse beeps for an alarm. (a) True (b) False
  26. 26.🔺 A 0.8 V supply is joined across an 8 Ω resistor. What current flows (in amperes)? =
  27. 27.🔺 A current of 2 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  28. 28.True or false: to leave fridge door open saves electricity. (a) True (b) False
  29. 29.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  30. 30.Which of these is measured in ohms (Ω)? (a) resistance (b) the flow of charge (c) voltage (d) the push of a cell
  31. 31.🧮 Adding another resistor in series makes the total resistance … (a) zero (b) bigger (c) smaller (d) stay the same
  32. 32.🔺 A current of 0.25 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
  33. 33.💡 A red LED (it uses 2 V) is joined with a 100 Ω resistor to a 3.5 V supply. What current flows (in mA)?
  34. 34.📏 In the water-pipe picture of a circuit, voltage is like … (a) the pipe colour (b) the tap handle (c) the water pressure (d) the water tank lid
  35. 35.🌈 A resistor has the colour bands grey, orange, red. What is its value in kilo-ohms (kΩ)? =
  36. 36.True or false: voltage is measured in volts (V). (a) False (b) True
  37. 37.True or false: on an LED, the leg by the flat edge is the anode (+). (a) False (b) True
  38. 38.True or false: the flow of charge is measured in amperes (A). (a) True (b) False
  39. 39.🌈 A resistor has the colour bands blue, black, orange. What is its value in kilo-ohms (kΩ)? =
  40. 40.🔺 A current of 2 A flows when 30 V is joined across a resistor. What is its resistance (in ohms)?

Answer key

  1. the flow of charge
  2. 300
  3. False
  4. 300
  5. anode (+)
  6. I = V ÷ R
  7. cathode (−)
  8. 1150
  9. 250
  10. 2530
  11. False
  12. True
  13. a buzzer
  14. 0.8
  15. cathode (−)
  16. 100
  17. buzzer
  18. 1.4
  19. P = V × I
  20. 0.1
  21. True
  22. V = I × R
  23. a motor
  24. blue-white-black
  25. False
  26. 0.1
  27. 6
  28. False
  29. 840
  30. resistance
  31. bigger
  32. 1.25
  33. 15
  34. the water pressure
  35. 8.3
  36. True
  37. False
  38. True
  39. 60
  40. 15

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