In a circuit, zener diode of zener voltage 12 V works with a load resistance RL=1 k Ω and series resistance Rs=100 Ω. If current through zener diode is 18 mA, then find the applied external voltage (in volt).

Question

In a circuit, zener diode of zener voltage 12 V works with a load resistance RL=1 k Ω and series resistance Rs=100 Ω. If current through zener diode is 18 mA, then find the applied external voltage (in volt). (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

According to the question, IZ=18 mA IL=(12/1 × 103) ⇒ 12 mA I=IZ+IL=30 mA Voltage drop on Rs is Vs=I Rs=100 × 30 × 10-3=3 V External voltage =12 V +3 V =15 V

Q. In a circuit, zener diode of zener voltage $12 V$ works with a load resistance $R_{L} = 1 k Ω$ and series resistance $R_{s} = 100Ω$ . If current through zener diode is $18 m A$ , then find the applied external voltage (in volt).

According to the question,
$I_{Z} = 18 m A$
$I_{L} = \frac{12}{1 \times 1 0 ^{3}}$
$\Rightarrow 12 m A$
$I = I_{Z} + I_{L} = 30 m A$
Voltage drop on $R_{s}$ is
$V_{s} = I R_{s} = 100 \times 30 \times 1 0^{- 3} = 3 V$
External voltage $= 12 V + 3 V = 15 V$

Q. In a circuit, zener diode of zener voltage 12V works with a load resistance RL​=1kΩ and series resistance Rs​=100Ω. If current through zener diode is 18mA, then find the applied external voltage (in volt).

According to the question, IZ​=18mA IL​=1×10312​ ⇒12mA I=IZ​+IL​=30mA Voltage drop on Rs​ is Vs​=IRs​=100×30×10−3=3V External voltage =12V+3V=15V

Q. In a circuit, zener diode of zener voltage $12 V$ works with a load resistance $R_{L} = 1 k Ω$ and series resistance $R_{s} = 100Ω$ . If current through zener diode is $18 m A$ , then find the applied external voltage (in volt).

According to the question,
$I_{Z} = 18 m A$
$I_{L} = \frac{12}{1 \times 1 0 ^{3}}$
$\Rightarrow 12 m A$
$I = I_{Z} + I_{L} = 30 m A$
Voltage drop on $R_{s}$ is
$V_{s} = I R_{s} = 100 \times 30 \times 1 0^{- 3} = 3 V$
External voltage $= 12 V + 3 V = 15 V$