Question:
In the circuit shown below, determine the current in the resistor.
Given:
\[
E=10.7\ \text{V}
\]
\[
R=10\,k\Omega
\]
Silicon diode in forward bias.
In the circuit shown below, determine the current in the resistor.
Given:
\[
E=10.7\ \text{V}
\]
\[
R=10\,k\Omega
\]
Silicon diode in forward bias.
Show Hint
For a forward-biased silicon diode, always subtract
\[
0.7\ \text{V}
\]
from the supply voltage before applying Ohm's law.
Updated On: Jun 16, 2026
- \(1\ \text{mA}\)
- \(1.07\ \text{mA}\)
- \(0.1\ \text{mA}\)
- \(10\ \text{mA}\)
Show Solution
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The Correct Option is A
Solution and Explanation
Concept:
A silicon diode in forward bias has a voltage drop of approximately
\[
0.7\ \text{V}.
\]
Hence the resistor gets the remaining voltage.
Step 1: Calculate the voltage across the resistor. \[ V_R=10.7-0.7 \] \[ V_R=10\ \text{V}. \]
Step 2: Apply Ohm's law. \[ I=\frac{V_R}{R} \] \[ =\frac{10}{10\times10^3} \] \[ =10^{-3}\ \text{A} \] \[ =1\ \text{mA}. \] \[\begin{aligned} \boxed{I=1\ \text{mA}} \end{aligned}\] Hence, option \(\mathbf{(A)}\) is correct.
Step 1: Calculate the voltage across the resistor. \[ V_R=10.7-0.7 \] \[ V_R=10\ \text{V}. \]
Step 2: Apply Ohm's law. \[ I=\frac{V_R}{R} \] \[ =\frac{10}{10\times10^3} \] \[ =10^{-3}\ \text{A} \] \[ =1\ \text{mA}. \] \[\begin{aligned} \boxed{I=1\ \text{mA}} \end{aligned}\] Hence, option \(\mathbf{(A)}\) is correct.
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