A `6V` zener diode along with a series resistance `R` is connected accrose a `12 V` supply. Calculate the minimum value of the resistance `R` required, if the maximum zener current is `30 mA`.

Explanation

To solve the problem, we need to determine the minimum value of the resistance \( R \) required in a circuit with a 6V Zener diode connected in series with a resistance \( R \) across a 12V supply, given that the maximum Zener current is 30 mA.

### Step-by-Step Solution:

1. **Identify Given Values**:
- Zener Voltage, \( V_Z = 6V \)
- Supply Voltage, \( V_{supply} = 12V \)
- Maximum Zener Current, \( I_Z = 30 mA = 30 \times 10^{-3} A \)
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