Heat Transfer - Lesson Check

Front

What is convection?

Back

Convection is the transfer of thermal energy by the movement of fluids (liquids or gases). It occurs when warmer, less dense fluid rises and cooler, denser fluid sinks, creating a current.

Front

Give an example of convection in cooking.

Back

Roasting chicken in an oven is an example of convection, where hot air circulates around the chicken, cooking it evenly.

Front

What type of heat transfer occurs when you hold your hand over a campfire?

Back

Both convection and radiation occur. Convection transfers heat through the movement of hot air, while radiation transfers heat through infrared waves.

Front

What is conduction?

Back

Conduction is the transfer of thermal energy through direct contact between materials. It occurs when heat moves from a hotter object to a cooler one.

Front

Provide an example of conduction in everyday life.

Back

Frying an egg in a hot pan is an example of conduction, where heat transfers from the pan to the egg.

Front

What is radiation?

Back

Radiation is the transfer of energy through electromagnetic waves. It does not require a medium (like air or water) to transfer heat.

Front

Give an example of radiation in real life.

Back

The heat from the sun reaching the Earth is an example of radiation.

Front

What is thermal energy?

Back

Thermal energy is the total kinetic energy of particles in a substance, which determines its temperature.

Front

How does a toaster work in terms of energy transformation?

Back

A toaster transforms electrical energy into thermal energy, heating the bread through conduction and the surrounding air through convection.

Front

What is a convection current?

Back

A convection current is a continuous cycle of fluid movement caused by the heating and cooling of the fluid, leading to the transfer of heat.