modified 6 years ago

Step1. Vbe is about 0.7 volt.

00:42:15

If current is flowing through the base, Vbe is always about 0.7 Volt. The Ib becomes (V -Vbe)/Rb. In this circuit, Ib equal (5 - 0.7)/1000=4.3mA.

V ... The supply voltage to base
Vbe ... The voltage from emitter to base.
Ib ... The current into base
Rb ... The resister connected base.

published 6 years ago

kiani

6 years ago

0.782 volts.

otameshi

6 years ago

For example, change the Rb to more big resister, the Vbe approaches to 0.7volts.

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