Conduction, equation explanation

•A
is the cross-sectional area

•L
= Δx is the
thickness of the slab or the length of
a rod

•P is in Watts when Q is in Joules and t is in seconds

•k is the *thermal
conductivity* of the material

–See table 11.3

–Good conductors have high k
values and good insulators have low k values