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Semiconductor devices may be used as switches. The base or gate of a transistor can be used as a control element to switch on or off the current between the source and collector.
Transistors.
Transistors are used in most electronic circuits. Unlike a simple switch, a transistor can turn a small current into a large one.
A manually operated electromechanical device with one or more sets of electrical contacts is the most common type of switch. Relays are switches that are operated by another electrical circuit.
The switches can be on or off. The switch is open when it’s off. Solid state transistors and vacuum tubes can be used in high voltage applications.
The Digital Logic Gates are connected to the internet. Digital logic gate is an electronic component that outputs a particular output after implementing its logic on the input signals. These are the basic building blocks of a digital system.
There are two inputs and two manually toggled switches in the AND gate switch circuit. When both switches A and B are open, we can explain how the AND gate works. The bulb won’t light up.
It’s important to focus on individual gates right now. The gate shown here with a single transistor outputs the exact opposite signal as what is input, so it’s called an “inverter” or “not gate”.
An example of a device’s characteristics is shown in a panel. 4.27 indicates that a positive and a negative are both present. There are more complicated logic circuits using a larger number of transistors.