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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 739 · 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 ohms (Ω)? (a) the push of a cell (b) the flow of charge (c) resistance (d) current
  2. 2.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) iron one shirt at a time (d) use LED lamps
  3. 3.🌈 A resistor has the colour bands brown, black, orange. What is its value in kilo-ohms (kΩ)? =
  4. 4.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  5. 5.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) use LED lamps
  6. 6.🌈 In the resistor colour code, which number does grey stand for?
  7. 7.🔺 A current of 20 mA flows through a 220 Ω resistor. What is the voltage across it (in volts)? =
  8. 8.🔺 An 8 V supply is joined across a 400 Ω resistor. What current flows (in milliamperes, mA)?
  9. 9.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  10. 10.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  11. 11.True or false: current is measured in amperes (A). (a) True (b) False
  12. 12.Which of these is measured in ohms (Ω)? (a) voltage (b) current (c) power (d) how much a part resists
  13. 13.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) smaller (c) bigger (d) zero
  14. 14.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  15. 15.🧮 Three equal 300 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  16. 16.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  17. 17.🔺 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
  18. 18.🌈 A resistor has the colour bands blue, violet, orange. What is its value (in ohms)?
  19. 19.🔺 A current of 0.5 A flows when 2.5 V is joined across a resistor. What is its resistance (in ohms)?
  20. 20.🔺 A current of 25 mA flows when 6.25 V is joined across a resistor. What is its resistance (in ohms)?
  21. 21.📏 How many milliamperes (mA) is 1.1 A?
  22. 22.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  23. 23.🧮 Two resistors in parallel give a total that is … (a) less than either one (b) their sum (c) more than either one (d) always zero
  24. 24.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  25. 25.🔺 A current of 1.5 A flows when 22.5 V is joined across a resistor. What is its resistance (in ohms)?
  26. 26.🔺 A current of 40 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
  27. 27.🧩 A capacitor in a circuit can … (a) measure heat (b) spin a wheel (c) store charge briefly (d) make light
  28. 28.⚡ Power tells us … (a) energy used each second (b) the size of a cell (c) the length of a wire (d) the colour of light
  29. 29.🔺 A current of 0.1 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
  30. 30.🔺 A current of 0.1 A flows when 1.5 V is joined across a resistor. What is its resistance (in ohms)?
  31. 31.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  32. 32.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
  33. 33.🧩 Which component senses how bright it is? (a) potentiometer (b) buzzer (c) LDR (d) diode
  34. 34.🔺 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
  35. 35.⚡ Which formula gives electric power? (a) P = V × I (b) P = I ÷ V (c) P = V + I (d) P = V ÷ I
  36. 36.🔺 A current of 40 mA flows through a 220 Ω resistor. What is the voltage across it (in volts)? =
  37. 37.🌈 In the resistor colour code, which number does red stand for?
  38. 38.True or false: a buzzer makes a beeping sound. (a) True (b) False
  39. 39.True or false: the ammeter measures current. (a) False (b) True
  40. 40.🔺 A current of 2 A flows when 24 V is joined across a resistor. What is its resistance (in ohms)?

Answer key

  1. resistance
  2. iron one shirt at a time
  3. 10
  4. 27
  5. use LED lamps
  6. 8
  7. 4.4
  8. 20
  9. 306
  10. 2.4
  11. True
  12. how much a part resists
  13. bigger
  14. 400
  15. 100
  16. 345
  17. I = V ÷ R
  18. 67000
  19. 5
  20. 250
  21. 1100
  22. 1140
  23. less than either one
  24. 10
  25. 15
  26. 4
  27. store charge briefly
  28. energy used each second
  29. 1.5
  30. 15
  31. 920
  32. use LED lamps
  33. LDR
  34. V = I × R
  35. P = V × I
  36. 8.8
  37. 2
  38. True
  39. True
  40. 12

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