I know the answer is 12 Volts , but can someone please explain. Thanks Assume th

Question

I know the answer is 12 Volts, but can someone please explain.

Thanks

Assume that you create a circuit for controlling a light bulb with a MOSFET as shown below. You can model the light bulb as a resistor RL. You can turn the light ON and OFF by controlling the input voltage to the MOSFET. You first decide to characterize the behavior of the MOSFET by measuring Ros as a function of the input voltage and get the following values: Vs# 12V VIN(volts ohms 1x106 90 80 3.9 0.01 17. Assume R- 3996 ohms and you supply 0 volts to the input gate. What will Vos be approximately? a) 12V b) 0.12V c) 1.2V d) 0.012V e) None of the above

Explanation / Answer

It is an n - channel Enhancement type mosfet, when we apply VG=0v, MOSFET remains in off state, therefore current flowing I'd will be zero. We need positive gate to source voltage greater than threshold voltage (VT) to conduct MOSFET and hence current will flow.

But here as VGS =0v current Id=0A. Therefore voltage drop across RD(RL) will be zero.

As we know that VDS=VDD- IdRd=12-0=12v.

Note- please find me in comment box if you find any difficulty.

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