How a Variable Resistor Works in an Electronic Circuit

Video Transcript

" Hello! This is Ross on behalf of the expertvillage.com. Well here is a circuit, it has a ceramic capacitor on it, it has an electrolytic capacitor, resistor here, connection for a 9 volt battery, but it also has... what do you think these are? I guess I better tell you. That’s why you are watching this. These are resistors, but variable resistors. Variable resistors are called potentiometers because schematic symbol for resistor is this, it reads this current. If it is variable though put an arrow through it and you have a variable resistor or a potentiometer. This one is the sliding one. This one rotates. So we have this connection going through, coming in, and you have the variable connection here. Slightly you can even tie it into the transistor and you can control how much the amplification is occurring. So if you want someone talking on the microphone be a little bit louder you can set it there and if you want it really loud, you can crank it all the up and the amplifier will be working harder. "