Question

A strain gage has a nominal resistance of 100 Ohms and a gage factor of 2.1. If it is used in a quarter bridge with other resistors being 100 Ohms and a supply voltage of 2.3 V, what will be the measured voltage when there is 11900 μstrain acting on the gage?

Answer 1

Vo = 12.5 mV

Step-by-step explanation:

given data

nominal resistance = 100 Ohms

gage factor = 2.1

other resistors = 100 Ohms

supply voltage = 2.3 V

strain = 11900 μ

solution

we get here voltage so we use here strain output formula

∈α =
`(Vo(R_2+R_(3i))^2)/(V_s S\ R_2\ R_(3i))`

put here value

11900 =
`(Vo(100 + 100)^2)/(2* (2.1)(100)(100))}`

solve it we get

Vo = 12495 V

Vo = 12.5 mV