Question

The given figure shows an electrical circuit consisting of two resistors of resistances 10 Ω and 20 Ω. A voltmeter connected across the 20-Ω resistor shows a reading of 16 V. Find is the voltage supplied to the circuit?​

Answer 1

Given :    an electrical circuit consisting of two resistors of resistances 10 Ω and 20 Ω

A voltmeter connected across the 20-Ω resistor shows a reading of 16 V.

To Find : voltage supplied to the circuit

Solution:

Case 1 : Resistances are in series

Then Total Resistance  =  10 + 20  =  30 Ω

Total Voltage applied = 30 x I

I = Current flowing through circuit

in Series circuit current flowing through both resistor would  be same

Hence current through 20 Ω Resistor is I

and Voltage across the 20-Ω resistor = 20I

Voltage across the 20-Ω resistor  = 16V

=> 20I  = 16

=> I = 16/20

Total Voltage applied = 30 x I  

= 30  x 16/20

=  24  V

voltage supplied to the circuit = 24 V

Case 2 : Both resistance are in parallel

then Voltage across each resistor =  total voltage applied to the circuit

Hence total voltage applied to the circuit = 16 V

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Answer 2

Answer:

Hope this helps..............