Question

2. For the circuit shown in below Figure, determine the p.d across resistor R3. If thetotal resistance of the circuit is 100 ohm, determine the current flowing throughresistor R. Find also the value of resistor R2R1 R2 R310v 4V V325v​

Answer 1

Given that,

Voltage across R₁ is 10 V

Voltage across R₂ is 4 V

Voltage across R3 is V₃

Voltage of the circuit is 25 V

To find,

The potential difference across R₃, the current flowing through R₁ and also the value of R₂.

Solution,

Total voltage, V = V₁ +V₂ + V₃ for series combination of resistors.

25= 10 +4 + V₃

V₃ = 11 V

In series combination current through all the resistirs is same. So,

$I=\dfrac{V}{R}\\\\I=\dfrac{25}{100}\\\\I=0.25\ A$

To find R₂

$R_2=\dfrac{V_2 }{I}\\\\R_2=\dfrac{4}{0.25}\\\\R_2=16\ \Omega$

Hence, this is the required solution.