When reverse biased, a PN junction diode acts as a?
Right Answer is:
An Open circuit
A diode is a two-electrode (two-terminal) device that acts as a one-way conductor. The most basic type of diode is the PN-Junction diode. When forward bias PN junction diode conducts. When reverse biased, it effectively blocks the flow of charge (current).
- A diode permits a current flow when the voltage on the anode is positive with respect to the voltage on the cathode.
- A diode inhibits current flow when the voltage on the anode is negative with respect to the voltage on the cathode.
A diode is called forward biased when the anode is positive with respect to the cathode. A forward-biased diode functions like a closed switch permitting current flow.
A diode is called reversed biased when the anode is negative with respect to the cathode. A reversed biased diode functions like an open switch (infinite Resistance) inhibiting current flow.
Based on the characteristics of a switch the following statements can be considered about the ideal diode:
When reverse biased (open switch):
- The diode has infinite resistance.
- The diode does not pass current.
- The diode drops the applied voltage across its terminals.