1.

The resistances of 5Ω,15Ω,20Ω and 10Ω are connected as shown in the circuit. Find the resultant resistance of the circuit. Find the resultant resistance of the circuit.

Answer»

5Ω, 15Ω resistors are connected in series in the circuit. So the resultant resistance of the two = 5 + 15 = 20 Ω.

The above resultant resistance is connected parallel to the 20Ω resistor.

Then the resultant resistance is 1/R = 1/R1 +1/R2 = 1/20 +1/20 = 2/20

1/R = 1/10 

R = 10Ω

This above resultant resistance is connected in series to the 10Ω again. 

So the total resultant resistance is 10 + 10 = 20Ω.



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