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Khalia · Answer 1 · 2024-05-30T22:17:04+0000

The value of
$R_e$ in a transistor circuit with a nominal collector current
$($ I_c $)$ of 10mA is 70 Ohms.

To determine the value of
$R_e$ (emitter resistor) in a transistor circuit with a nominal collector current
$($ I_c $)$ of 10mA, we can use Ohm's Law
$($ V = I \cdot R $)$ .

The emitter current
$($ I_e $)$ is approximately equal to the sum of the collector current
$($ I_c $)$ and the base current
$($ I_b $)$ in a transistor circuit.

$I_e = I_c + I_b$

Assuming a small base current
$($ I_b $)$ , we can approximate
$I_e$ to be equal to
$I_c$ .

Given that
$I_e = 10mA$ , we can now choose the emitter resistor
$($ R_e $)$ using Ohm's Law:

$R_e = (V)/(I_e)$

The voltage across the emitter resistor V is typically around 0.7V for a silicon transistor.

Let's calculate:

$R_e = (0.7V)/(10mA)$

= 70 Ohms

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