How Buzzer Circuit WorksThe two long wires act in the place of the one long wire. When their reactors are connected, then it has the same effect as with the single wire.
Turn On Switch - How It WorksWhen it's on you have a closed circuit which flows from one end to the other. When you turn it off it opens the circuit.
How the tactile pushbutton circuit worksWhen the button is not pushed the red LED turns on because the circuit connects the LED to both positive and negative. When the button is pushed the green LED lights up because the short prong connects to the diode, resistor, then the bottom bus, but since the button is pushed the circuit closes connecting the long prong to the top bus making the LED light up.
How electricity creates a magnetThe wire created an electric field around the bolt. When a wire has an electric current going through it there is an electric field around it. by wrapping the wire around the bolt you enhance the electric field, allowing certain metal objects to be picked up with it.
What is a thermistorThe thermistor is a resistor that reacts to changes in temperature, when cold the resistance increases, when warm the resistance decreases.
Multiple resistors like multiple damsThe electrical current going through the resistors reduces as it passes through multiple resistors. Therefore when it comes out the other end of the resistors, it almost reduces to nothing.