A Zener of power rating 1 W is to be used as a voltage regulator. If Zener has a breakdown of 5 V and it has to regulate voltage which fluctuated between 3 V and 7 V, what should be the value of Rs for safe operation (see figure)?
This is a Short Answer Type Questions as classified in NCERT Exemplar
Explanation- power = 1W
Zener breakdown voltage = 5V
Minimum voltage = 3V
Maximum voltage = 7V
Current = power/voltage= 1/5=0.2A
The value of R for safe operation would be R = max voltage – Zener voltage/current
= 7- 5/0.2 = 2/0.2 = 10ohm
<p>This is a Short Answer Type Questions as classified in NCERT Exemplar</p><p><strong>Explanation- </strong>power = 1W</p><p>Zener breakdown voltage = 5V</p><p>Minimum voltage = 3V</p><p>Maximum voltage = 7V</p><p>Current = power/voltage= 1/5=0.2A</p><p>The value of R for safe operation would be R = max voltage – Zener voltage/current</p><p>= 7- 5/0.2 = 2/0.2 = 10ohm</p>
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