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A zener diode voltage regulator has load requirement of 12V and 2 Amp. The zener diode's minimum current requirement is 0-2A. The minimum voltage at input is 24V. What isthe maximum efficiency of circuit ?
  • a)
    34.3%
  • b)
    45.5%
  • c)
    52.8%
  • d)
    66.3%
Correct answer is option 'B'. Can you explain this answer?
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A zener diode voltage regulator has load requirement of 12V and 2 Amp....
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A zener diode voltage regulator has load requirement of 12V and 2 Amp....
Given:
Load requirement: 12V, 2A
Zener diode minimum current requirement: 0-2A
Minimum input voltage: 24V

To find:
Maximum efficiency of the circuit

Explanation:
The efficiency of a voltage regulator circuit is given by the formula: Efficiency = (Output power / Input power) * 100

Step 1: Find the output power:
The output power can be calculated using the formula: Output power = Output voltage * Output current
Given that the load requirement is 12V, 2A, the output power is: Output power = 12V * 2A = 24W

Step 2: Find the input power:
The input power can be calculated using the formula: Input power = Input voltage * Input current
Given that the minimum input voltage is 24V, we need to find the minimum input current for maximum efficiency.
Since the minimum current requirement of the zener diode is 0-2A, we can assume the worst-case scenario and consider the minimum current of 0A.
Therefore, the input power is: Input power = 24V * 0A = 0W

Step 3: Calculate the efficiency:
Using the formula for efficiency: Efficiency = (Output power / Input power) * 100
Substituting the values we calculated in steps 1 and 2:
Efficiency = (24W / 0W) * 100 = Undefined

Conclusion:
The efficiency of the circuit is undefined because the input power is zero. This means that the circuit is not operating within the specified parameters and is unable to provide any power to the load. Therefore, the correct answer is not provided in the options given.
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