The active element in a load cell is a strain gauge with a nominal resistance of 500 U in its unstressed state. The cell has a sensitivity of þ0.5 U per Newton of applied force and is connected in a...

The active element in a load cell is a strain gauge with a nominal resistance of 500 U

in its unstressed state. The cell has a sensitivity of þ0.5 U per Newton of applied

force and is connected in a DC bridge circuit where the other three arms of the

bridge each have a resistance of 500 U.

(a) If the bridge excitation voltage is 20 V, what is the measurement sensitivity of

the system in volts per Newton for small applied forces?

(b) What is the bridge output voltage when measuring an applied force of 500 N?