Heat Transfer - Conduction and Convection _ GCSE Physics

The video tutorial explains the concepts of conduction and convection as methods of heat transfer. Conduction occurs in solids where heat is transferred through direct contact, with metals being excellent conductors due to free electrons. Convection occurs in gases and liquids, where heated substances rise and cooler ones sink, creating convection currents. An example of convection is the heating of a room by a radiator.

What is the primary reason metals feel colder than wood when touched?

• Metals conduct heat away from the body more efficiently.

• Wood is a better conductor of heat than metals.

• Metals are naturally colder than wood.

• Wood absorbs heat more quickly than metals.

How is heat transferred in the process of conduction?

• Through the movement of free electrons.

• By the expansion and rising of heated gases.

• Through the cooling and falling of liquids.

• Via the vibration of particles in direct contact.

What happens to a gas or liquid when it is heated in the process of convection?

• It becomes denser and falls.

• It expands and rises.

• It contracts and sinks.

• It remains at the same density.

Which of the following best describes a convection current?

• A flow of heat through solid materials.

• A cycle of rising warm air and sinking cool air.

• A transfer of heat through direct contact.

• A movement of free electrons in metals.

In a room heated by a radiator, how is the heat primarily distributed?

• By radiation from the radiator.

• Via direct contact with the radiator.

• Through conduction in the air.

• By convection currents in the air.