Study of V-I Characteristics of a Diode.
Diode Characteristics Kit, Power Supply, Ammeter (0-20mA), Voltmeter (0-20V), Connecting Leads.
Brief Theory:A P-N junction is known as Semiconductor diode or Crystal diode. It is the combination of P-type & N-type Semiconductor. This offers nearly zero resistance to current on forward biasing & nearly infinite Resistance to the flow of current when in reverse biased.
Forward biasing:When P-type semiconductor is connected to the +ve terminal and N-type to –ve terminal of voltage source. Nearly zero resistance is offered to the flow of current.
Reverse biasing:When P-type semiconductor is connected to the –ve terminal and N-type to +ve terminal. Nearly zero current flow in this condition.
Circuit Diagram:
S.No. | When Diode Is Forward Biased/Current(m A)/Voltage(V) | When Diode Is Reverse Biased/Current (µA)/Voltage(V) |
1 | ||
2 | ||
3 | ||
4 | ||
5 | ||
6 |
Graph:
Result:The graph has been plotted between voltage and current.
Discussion:The diode doesn’t conduct in RB state and conduct in FB state.
Precautions:
Quiz:
Q:Define semiconductor diode?
A:A PN – junction is called semiconductor diode.
Q:Define depletion layer?
A:The region having uncompensated acceptor and donor ions.
Q:What do you mean by forward biased?
A:When +ve terminal of battery is connected to P side & -ve terminal to N side of diode.
Q:What do you mean by reverse biased?
A:When +ve terminal of battery is connected to N side & -ve terminal to P side of diode.
Q:Define Knee voltage?
A:The forward voltage at which current through the junction starts increasing rapidly.
Q:Define breakdown voltage?
A:Reverse voltage at which PN junction breaks down with sudden rise in reverse current.
Q:Define max. Forward current?
A:It is highest instantaneous forward current that a PN junction can conduct without damage to Junction.
Q:Define max. Power rating?
A:Max. Power that can be dissipated at junction without damage to it.
Get all latest content delivered to your email a few times a month.