Wheat Stone Examples

For the Following Bridge confirm if

a. The following Bridge is balanced ?

b. The value of Vout

c. Which resistor should be used at r4 to balance bridge

a. Checking if Bridge is balance or not

a. For this purpose we may use the wheat stone formula

b. Find the Value at Vout .

a. Finding ACB

usinng Formula

=72.72 Volts

c. Calculating ADB

Plugging in value

Calculating Potential Difference

V= Vd-Vc

=14.28v-72.72v=-57.92 V

Find the New value of R4 if bridge is to be balanced

.

=320 v

Question 2

A circuit consists of two resistors with resistances R1 = 160 Ω and R2 = 15 Ω , a variable resistor, which can be adjusted, and 25 v volt battery connected as shown in the figure. When Rvar is adjusted to 12 ohms, there is zero current through the ammeter. What is the unknown resistance Ru ?

Also Confirm the Current value mathematically , that will be shown by ammeter if the bridge is balanced

Finding Unknown resistance

Plugging Values

Finding Current Value

If the bridge is balanced the value of ammeter is 0 Ampere

It = 1.69 Ampere