please answer only c part . thanks Fig. 4.1 shows a potential divider circuit that operates a light bulb rated 25 W 5 V. Thepotential divider is made up of two identical fixed resistors R, a thermistor and a variableresistor. Each resistor R has a resistance of 100 kQ. The variable resistor can vary overa range of 1000-100 MQ. The thermistor also has a range of 100 Q-100 MQ.4variable resistor100 - 100 MOthermistor100 - 100 MO10 VAbulb25 W 5 VR.OVFig. 4.1(a)What is the role of the thermistor in the circuit?It is used to vary the potential at point A at different temperatures.(b)Describe the use of the variable resistor in this circuit.It is used to vary the potential at point B at different temperatures.As a result, it can be used to control the potential difference between Aand B thereby adjusting the brightness of the bulb at differenttemperatures.(c)State th esistance of the thermistor for the light bulb to work optimally when thevarole resistor is set to 100 kn. Give reasons for your answer.R

For bulb work properly the voltage across the bulb should be 5V. So voltage difference between point…

Answered: (c) State the esistance of the…

(c) State the esistance of the thermistor for the light bulb to work optimally when the varole resistor is set to 100 k2. Give reasons for your answer.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

please answer only c part . thanks

Fig. 4.1 shows a potential divider circuit that operates a light bulb rated 25 W 5 V. The
potential divider is made up of two identical fixed resistors R, a thermistor and a variable
resistor. Each resistor R has a resistance of 100 kQ. The variable resistor can vary over
a range of 1000-100 MQ. The thermistor also has a range of 100 Q-100 MQ.
4
variable resistor
100 - 100 MO
thermistor
100 - 100 MO
10 V
A
bulb
25 W 5 V
R.
OV
Fig. 4.1
(a)
What is the role of the thermistor in the circuit?
It is used to vary the potential at point A at different temperatures.
(b)
Describe the use of the variable resistor in this circuit.
It is used to vary the potential at point B at different temperatures.
As a result, it can be used to control the potential difference between A
and B thereby adjusting the brightness of the bulb at different
temperatures.
(c)
State th esistance of the thermistor for the light bulb to work optimally when the
varole resistor is set to 100 kn. Give reasons for your answer.
R

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