A zener diode of power rating 1.6 W is to be used as voltage regulator. If the zener diode has a breakdown of 8 V and it has to regulate voltage fluctuating between 3 V and 10 V. The value of resistance $R_{s}$ for safe operation of diode will be [2023]

Question

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(3)

$V_{b} = 8 volt$

$V_{A} - V_{B} = 8 volt$

$Current through zener diode,$

$i = \frac{P}{V} = \frac{1.6 W}{8 V} = 0.2 A$

$V_{C} - V_{A} = 10 - 8 volt$

$R = \frac{V_{C} - V_{A}}{i} = \frac{2 V}{0.2 A} = 10 Ω$

[Note: A zener diode can regulate only if input voltage $\geq$ zener breakdown voltage. The range of input voltage should be 8 to 10V so that output voltage remains constant = 8V]

Solution

Q.
A zener diode of power rating 1.6 W is to be used as voltage regulator. If the zener diode has a breakdown of 8 V and it has to regulate voltage fluctuating between 3 V and 10 V. The value of resistance $R_{s}$ for safe operation of diode will be [2023]

1 $13.3 Ω$

2 $12 Ω$

3 $10 Ω$

4 $13 Ω$

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Solution

Q. A zener diode of power rating 1.6 W is to be used as voltage regulator. If the zener diode has a breakdown of 8 V and it has to regulate voltage fluctuating between 3 V and 10 V. The value of resistance Rs for safe operation of diode will be [2023]

1 13.3 Ω

2 12 Ω

3 10 Ω

4 13 Ω