A 10V of zener diode is connected in series to a resistance across a power supply of 50 V calculate the minimum value of resistance required such that the zener current is 25 mA

Explanation

To solve the problem step-by-step, we will follow these calculations:

### Step 1: Understand the Circuit
We have a Zener diode with a breakdown voltage of 10V connected in series with a resistor (R) across a power supply of 50V. The Zener current (I_Z) is given as 25 mA (0.025 A).

### Step 2: Apply Kirchhoff's Voltage Law
According to Kirchhoff's Voltage Law, the sum of the voltages in a closed loop must equal zero. In this case, the voltage across the resistor (V_R) plus the voltage across the Zener diode (V_Z) must equal the supply voltage (V_S):
\[ V_S = V_R + V_Z \]
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