Reverse Polarity Circuit Protection Using Diodes

in this video we're going to talk about how you can protect your circuit from reverse polarity damage so let's say you have your battery and it's connected to some device or load resistor let's call this device d and let's say this is the correct way to connect it so in this case current is going to flow in in the clockwise direction but sometimes you can make a mistake you can accidentally connect the device in the wrong way and by doing so you can cause damage to your circuit so what we want to do is we want to find out how to protect the circuit just in case by accident we connect the battery to the circuit in the wrong way one solution to this problem is the use of a diode so let's say we connect the device to and so here is our device and that is it now let's label our diodes d1 d2 d3 and d4 and let's call this point a b c and d so current is going to flow from the positive terminal of the battery to point a and from point a it's going to go through d1 because it's in ford bias mode it can't go through d4 because that's in reverse bias mode so d4 blocks the current from flowing from point a to point d so it's gonna flow from point b and it's gonna go through the device in this direction from top to bottom and then it's going to continue to flow towards point d now once it gets to point d it's not going back to a instead it's going to go through d3 to point c and then it's going to go back to the battery so in the device it's going from the positive terminal to the negative terminal it's flowing in this direction now let's see what happens if we reverse the polarity of the battery our goal is to make sure that the current flowing through the device