Home
Class 12
PHYSICS
In the circuit, the value of beta is 100...

In the circuit, the value of `beta` is 100. find `I_B,V_(CE),V_(BE)` and `V_(BC)`, when `I_C`=1.5mA. The transistor is in active, cut off or saturation state?

Text Solution

Verified by Experts

`beta=100,I_C=1.5mA=1.5xx10^(-3)A,V_CC=24V`
`beta=(I_C)/(I_B)`
`I_B=(1.5xx10^(-3))/(100)=15muA`
To calculate `V_CE` we apply kirchhoff.s rule CEFDC, therefore
`V_CC=I_Cxx4.7kOmega+V_CE`
`24=1.5xx10^(-3)xx4.7xx10^(3)+V_(CE)`
`V_CE=24-7.05=16.95V`

Again applying Kirchhoff.s rule to loop ABEFDCA, we get,
`V_CC=I_Bxx220kOmega+V_BE`
`V_BE=24-3.3`
`V_BE=20.7V`
Going along loop ABCA,we get
`I_Bxx220kOmega+V_BC=I_Cxx4.7kOmega`
`15xx10^(-6)xx220xx10^(3)+V_BC=1.5xx10^(-3)xx4.7xx10^(3)`
`V_BC=7.05-3.3=3.75V`
As `V_CEltV_BE`, both the juction are forward biased.So, the transistor is in the saturation state.
Promotional Banner

Topper's Solved these Questions

  • SEMICONDUCTOR ELECTRONICS

    FULL MARKS|Exercise Additional Question (Long Answer Questions.)|3 Videos

  • SAMPLE PAPER-8

    FULL MARKS|Exercise PART-IV|10 Videos

Similar Questions

Explore conceptually related problems

In the circuit shown in the figure, the input voltage V_i = +5 V, V_(BE) = + 0.8 V and V_(CE) = +0.12 V . Find the values of I_B I_C and beta .

In the circuit shown in the figure , the input voltage V_i is 20 V, V_BE =0V and V_CE =0V. What are the value of I_B,I_C,beta ?

In Fig (a) , the V_(BB) supply can be varied from 0 V to 5.0 V . The Si transistor has beta_(dc) = 250 and R_(B) = 100 kOmega , R_(C) = 1 k Omega , V_(C C) = 5.0 V . Assume that when the transistor is saturated , V_(CE) = 0V and V_(B E) = 0.8 V . Calculate (a) the minimum base current , for which the transistor will reach saturation .

Assuming V_Cesat=0.2V =0.2 and beta=50 ,Find the minium base current (I_B) required to drive transitor given in the figure to saturation.

When a voltage of 120V is impressed across the primary of a transformer , the current in the primary is 1.85mA . Find the voltage across the secondary , when it delivers 150mA . The transformer has an efficiency of 95%

A n-p-n transistor circuit has alpha=0.985. if I_(C)=9mA than the value of I_(B) is ………

From the output characteristics shown in Figure , calculate the values of beta_(ac) and beta_(dc) of the transistor when V_(CE) is 10 V and I_(C) = 4.0 mA .