Now, if you apply a 5 volts logic at base input, you will see LED glowing. Otherwise, it will remain off.Also, use a 220Ω resistor between the switch and base terminal.10kΩ resistor will limit the current below the forward current requires to turn on an LED.Also, a fet would really be a better choice here. you could also use a pnp in addition to your 2n2222, pull the pnp base low with the npn. If you use 10kΩ LED will not glow when you turn on the switch due to low current passing through the LED. the emitter will be 0.6v under the base when on.By mistake, 10kΩ used as a current limiting resistor with an LED. Connect an LED with an emitter terminal through a 220-ohm resistor.5 volts with collector terminal through 220ohm resistor. In this example circuit, we attach a push-button with a base terminal. The device is housed in the TO-92 package, which is designed for medium power applications. After that, we will see an example of controlling a dc motor with Arduino Uno. The NPN Bipolar Transistor is designed for use in linear and switching applications. First, we will see an example of a simple LED controlling example with a switch. In this section, we will discuss some examples using this NPN transistor. Current, voltage and power can be easily amplified by using these configuration modes. Similarly in the amplification application, it can be connected in three configurations such as common emitter, common collector and common base. A current limiting resistor is also in the circuit for limiting the base current because it could be damaged the transistor if the source current is greater than 5mA.Similarly in the cut-off region, no current flows from emitter to collector then it acts as a turn off the switch. Therefore the user cannot connect the load whose current is greater than 800mA
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