If a strain gage reads 75mV when 300 lbs is applied and 0mV

If a strain gage reads 75mV when 300 lbs is applied, and 0mV when 0 lbs is applied, how much weight is needed to give a reading of 24mV?

Solution

A strain gauge gives a reading of 0 mV if ) lbs weight is applied and 75mV if 300 lbs weight is applied. Then, to get a reading of 24 mV, a weight of (300/75) * 24 = 96 lbs has to be applied.