If two metallic plates of equal thickness, equal cross section area and thermal conductivities K 1 and K 2 are put together face to face (series combination) and a common plate is constructed, then the equivalent thermal conductivity of this plate will be-
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Flow of a quantity with time is known as a current. It can be fluid current or heat current or electric current.
In case of fluid current a pressure difference is maintained and that drives the flow of fluid and fluid always flows from high pressure region to the low pressure region and fluid current is governed by fluid resistance too.
Whereas in electric current the electric charge flows with time and the voltage difference and electric resistance combined will govern the electric current. Charge flows from higher voltage to lower voltage naturally.
Similarly in thermal current it is governed by temperature difference and thermal resistance.
Thermal resistance of a thermal conductor of length ' 
' and cross sectional area ' 
' and thermal conductivity ' 
' is given by 
Thermal resistance of first conductor is 
Thermal resistance of the second conductor is 
When both are put together face to face then they will be in series and series effective thermal resistance will be ' 
'
Effective length will be ' 
' and effective cross section will be ' 
' and effective thermal conductivity be ' K '
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