Question

if the total resistance of a given circuit is 20 ohm then calculate the resistance of resistor X and current flowing through a circuit ​

Answer 1

Answer:

Explanation:

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Answer 2

Given:

Rt=20 ohms

To Find:

Resistance of resistor (X)=?

Current (I)=?

Solution :

Case 1 :

Solve for Series Circuit and assume circuit has two resistors

Rt=R1+R2

20=R1+R2

In this case suppose R1=R2=10 ohms then Rt=20 ohms

Case 2 :

Solve for parallel circuit and assume circuit has two resistors

In this case if R1=R2=40 ohms then Rt=20 ohms

$\frac{1}{Rt}$=$\frac{1}{R1} +\frac{1}{R2}$

$\frac{1}{Rt}$=$\frac{1}{40} +\frac{1}{40}$

$\frac{1}{Rt}$=0.025+0.025

$\frac{1}{Rt}$=0.05

Rt=$\frac{1}{0.05}$

Rt=20 ohms

According to ohms law V=IRt

Total current in Circuit is  

I=$\frac{V}{R}$

I=$\frac{V}{20}$

Actually value of current (I) depends upon voltage (V)