In the reverse-bias condition, the negative terminal of the source is connected to the anode side of the circuit and the positive terminal is connected to the cathode side.
Ideal diode:when Ideal diode is in forward biased condition it will conduct with out any voltage drop and resistance across the diode is zero. under reverse biased condition it will not conduct ,it is completely turn offReal diode:when the real diode is in forward biased condition it is not a perfect conductor with zero resistance because in real diode some resistance(few ohms) is present. under reverse biased condition it will take certain time to turn off
It would be 0.7V, the same as any other silicon diode; except for one thing, most zener diodes are manufactured with a reversed diode in series with them. When the zener is operated in its normal zener breakdown mode this reversed diode conducts, letting the zener operate. When the zener is operated in its forward biased mode this reversed diode prevents conduction. Thus most zeners have no forward voltage.
we say a diode to be in forward biased condition when we connect the positive terminal of the diode(anode) to the positive terminal of the power supply and the negative terminal(cathode) to the negative of the power supply. If we do it in the opposite way i.e. connecting positive terminal to the negative powersupply or viceversa it is called to be in reverse biased condition. In general diodes are configured to work in forward biased condition and not in reverse biased condition. Though there is a certain amount of conductivity in reverse biased condition of a diode due to leakage current.
In the varying input condition, the zener diode is used in such a that any variation in the input voltage,should not in any affect the load (that is the arrangement supplies just the voltage needed by the load no matter how high or low the supply voltage might go). In the varying load condition, the zener diode is connected in such a way that any change in the load voltage should not affect the input voltage.
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