Bridge circuit

Okay kiddo, let me explain what a bridge circuit is. Have you ever played with a see-saw in the playground? Imagine that there are two kids sitting on each end of the see-saw, and they weigh the same amount, so the see-saw is perfectly balanced in the middle.

Now, imagine that one of the kids gets off the see-saw, and it tips to one side because the weight is uneven. This is what happens in a bridge circuit.

A bridge circuit is a type of electronic circuit that uses four resistors (which are like tiny roadblocks for electricity) in a diamond shape. It also has two input voltage sources and one output voltage source.

The goal of the bridge circuit is to compare two voltages and see if they are equal. If they are equal, then the output voltage is zero, which means it's perfectly balanced like the see-saw with two kids of the same weight. If the two voltages are not equal, then the output voltage becomes positive or negative, and the bridge circuit becomes unbalanced, just like the see-saw when one kid gets off.

So, engineers use bridge circuits to measure things like temperature, pressure, and other physical quantities. By measuring changes in the output voltage of the circuit, they can tell how these physical quantities are changing.

In summary, a bridge circuit is like a tiny see-saw that compares two voltages to see if they are the same or different. It's used to measure stuff like temperature and pressure.