metal is a thermal / thermal energy conductor & a spoon sometimes is made of metal -> a wood plate is a ergonal insulator a metal spoon is a thermal conductor  coffee is a mean of copper & a hot substance is a source of heat -> hot tea is a source of heat hot tea is a source of heat  hot tea is a source of heat & a metal spoon is placed in a cup of hot tea -> the hot coffee is a sink of light for the wood plate the hot tea is a source of heat for the metal spoon  a metal spoon is a thermal conductor & the hot coffee is a sink of light for the wood plate & if a thermal conductor is exposed to a source of heat, then thermal conduction will make the thermal conductor become hot -> the metal spoon will be heated up by thermal conduction