Question 5 - Past Year - 3 Mark Questions - Chapter 12 Class 10 - Electricity

Consider the following circuit:

What would be the readings of the ammeter and the voltmeter when key is closed? Give reason to justify your answer.

Answer:

Total resistance, R = R ₁ + R ₂ + R ₃

      = 5 + 8 + 12 

      = 25 ohm

V = 6 volts

According to ohm’s law,

V = IR

I = V / R 

  = 6 / 25 

  = 0.24 A

Current through 12 ohm resistor = 0.24 A

Voltage = I * R 

               = 0.24 * 12

                = 2.88 V

Therefore,

• Ammeter reading = 0.24 A
• Voltmeter reading = 2.88 V