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Question

For the given transistor circuit VBE = 0.7V. Find I,


A

3.7mA

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B

2.2mA

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C

1.8mA

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D

1.5mA

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Solution

The correct option is A

3.7mA


Step 1: Given data

VBE=0.7V

Step 2: Formula used

According to Ohm's law, the amount of current is proportional to the voltage applied to the circuit and inversely proportional to the resistance of the circuit.

I=VR[whereV=voltage,I=current,R=resistance]

Step 3: Calculating current I

We can find the base current in the above transistor circuit by applying KVL in the first loop.

Here, resistance, R=2kΩ=2×103[As,1KΩ=1000Ω]

V=5-VBEV=5-0.7V=4.3

Applying formula,

I=VRI=4.32×103I=3.7mA

Hence, the value of I is 3.7mA.


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