Draw a labelled diagram using zener diode for constant voltage power supply.

Explanation

To draw a labeled diagram using a Zener diode for a constant voltage power supply, follow these steps:

### Step 1: Draw the Input Voltage Source
- Start by drawing a voltage source labeled \( V_{in} \). This represents the unregulated input voltage.

### Step 2: Connect a Series Resistor
- Draw a resistor labeled \( R_s \) connected in series with the voltage source. This resistor limits the current flowing through the circuit.

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