"Temp difference in thermal conductivity is like pressure difference in fluids or potential difference in electricity! -> Rate of heat flow is like volume flow rate or current.
(ΔT = IR, ΔP = QR, ΔV = iR) -> in all cases, thicker conduits allow greater flow, longer conduits impede flow, and flow rate depends upon difference in a property of the reservoirs at either end of conduit."