A strain gauge, a transducer that converts mechanical strain into electrical signals, is often used to measure force. The engineer's role involves designing the Wheatstone bridge circuit, having strain gauges in each arm, and identifying the required amplification for the output voltage. Here, it is assumed that the applied force increases the resistance of two strain gauges while the resistance decreases in the other two. Also, the relationship between the bridge output voltage and the change in resistance is known. This can be achieved using Thevenin's theorem. Knowing the input voltage, the currents in the top and bottom branches are first determined. These values are then substituted into Ohm's law to calculate the Thevenin voltage. The source is removed to calculate the Thevenin resistance, and the equivalent resistance is determined in a simplified form. From the Thevenin equivalent circuit, the bridge output voltage is calculated using the voltage division rule. Comparing the obtained relation with the known relation allows the determination of the amplifier gain needed to design the circuit to work within the desired range.