# Can a transistor be used as a switch?

## Can a transistor be used as a switch?

Transistors may be used as switching elements to control DC power to a load. The switched (controlled) current goes between emitter and collector; the controlling current goes between emitter and base. When a transistor has zero current through it, it is said to be in a state of cutoff (fully nonconducting).

## Can a transistor handle 12V?

If you’re using 12V, you shouldn’t have a problem with this. NPN (and PNP) transistors look like a diode from the base to the emitter. If you try to drive it without someway to limit the current, the transistor will be destroyed.

## Which is an example of a transistor as a switch?

Transistor as a Switch 1 NPN Transistor as a Switch. Based on the voltage applied at the base terminal of a transistor switching operation is performed. 2 Example of NPN Transistor as a Switch. 3 PNP Transistor as a Switch. 4 Example of PNP Transistor as a Switch. 5 Practical Examples of Transistor as a Switch.

## Can a PNP transistor be used as a switch?

A motor always consumes the maximum current when stalled. Thus the load voltage is 12VDC and the maximum load current is 1.25 A Vload = 12V Iload (max) = 1.25A In general, we can use both PNP or NPN transistors as switches. However, PNP transistors can only control the same voltage as is supplied to the Arduino chip.

## Why are multiple transistors used in a bipolar transistor?

Sometimes the DC current gain of the bipolar transistor is too low to directly switch the load current or voltage, so multiple switching transistors are used. Here, one small input transistor is used to switch “ON” or “OFF” a much larger current handling output transistor.

## What is the base current of a silicon transistor?

For silicon transistor, V BE = 0.7 V Therefore, as the base current is greater than 56.8 micro ampere current, the transistor will be driven to saturation i.e., it is fully ON, when 5V is applied at the input. Thus, the output at the collector becomes approximately zero.