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MHT-CET : Physics Entrance Exam

MHT - CET : Physics - Thermionic Emission Know More

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1.      The Constants of the Triode:

1.      Amplification Factor: It is the ratio of the change in plate voltage to the change in grid voltage for a constant plate current.

m

dVp

 

 Ip = constant. The amplification factor m has no unit.

dVg

2.       

3.      Transconductance: It is the ratio of the change in plate current to the change in grid voltage for a constant plate voltage.

gm = 

dIp

 

 Vp = constant. The unit of transconductance gm is mho or siemens.

dVg

4.       

5.      Plate Resistance: It is the ratio of change in plate voltage to the change in plate current when the grid voltage is kept constant.

rp

dVp

 

 Vg = constant.

dip

2.       

3.      Relation between Triode Constants: m = rp gm.

4.      The 'Child-Langmuir Law': In the space charge region of the vacuum diode characteristic, the relation between the plate current (Ip) and the plate potential (Vp) is given approximately by the 'Child-Langmuir Law' which is as follows:

Ip = KV
p3/2,

where 

Ip

= plate current

 

K

= constant

 

Vp

= plate potential

5.       

Vacuum diode characteristic

6.     

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