Reverse Bias: Diode, Resistor, Voltage & Current

In summary, in forward bias, the supplied voltage is divided between the resistor and diode connected in series. However, in reverse bias, the current through the resistor remains zero until a very high voltage is supplied. This is due to Ohm's law, where the current through the resistor is directly proportional to the voltage across it. Therefore, when there is no current flowing through the circuit, there can be no voltage across the resistor. This also applies to the diode, where no current flows through it in reverse bias.
  • #1
XuFyaN
50
0
In forward bias the supplied voltage is distribute among the resistor and the diode (diode and resistor are connected in series) but in reverse bias the Current across the resistor remain zero because the conduction starts when very high voltage is supplied ...am i right ?
but why the Voltage across resistor and current across resistor remain also zero when resistor and diode are connected in series in Reverse Bias ??
 
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  • #2
You cannot have current across something. Your wording my have me confused. Ohms law can pretty much explain your question. In reverse bias prior to the diodes breakdown voltage no current is flowing so no voltage can develop across the resistor.
 
  • #3
i want to know why the voltage across Resistor , current across the resistor is zero in reverse bias ??
 
  • #4
As ASN said you cannot speak of "current across" anything. Think of it as current through the resistor. The current through the resistor is zero because the total circuit current is zero (or at least VERY small). Since the current through the resistor is zero by Ohms law so is the voltage. Note that current through the diode is also zero.
 
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  • #5
Thanks a lot :)
 

FAQ: Reverse Bias: Diode, Resistor, Voltage & Current

1. What is reverse bias?

Reverse bias is a condition in which the voltage applied to a diode or other semiconductor device is in the opposite direction of its normal operation. This results in a decrease in current flow through the device.

2. How does reverse bias affect a diode?

Reverse bias causes the depletion region of a diode to widen, creating a larger barrier for current to flow through. This results in a decrease in current flow and a high resistance state.

3. Can a resistor be reverse biased?

Yes, a resistor can be reverse biased if it is connected in the opposite direction of the current flow. This will result in a decrease in current flow through the resistor.

4. What is the effect of voltage on reverse bias?

The higher the reverse bias voltage applied to a diode or resistor, the wider the depletion region becomes and the lower the current flow through the device. This relationship is known as the reverse bias voltage-current characteristic.

5. How does reverse bias protect electronic circuits?

Reverse bias is often used as a protective measure in electronic circuits. When a reverse bias voltage is applied, it prevents excessive current flow through the device, protecting it from damage. This is commonly seen in diodes used as voltage regulators in electronic circuits.

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