Heat Energy

Question 1

In what 3 ways does heat move?

Answer 1

Conduction, Convection or Radiation

Question 2

What is Conduction?

Answer 2

Conduction of heat occurs within an object as higher temperatures move towards cooler areas.
EG. Heat traveling up the copper pipe whist soldering.
Boiler castings becoming warm when operating.

Question 3

What is a good conductor?

Answer 3

Copper
Aluminium
Iron
Glass

Question 4

What is a bad conductor?

Answer 4

Air
Polysturene
Wood
Water

Question 5

What is the equation for thermal conductivity?

Answer 5

heat x distance / area x temperature difference

Question 6

What is the rate at which material will transfer heat to known as?

Answer 6

Coeffieient of theraml conductivity

Question 7

What is the ‘U Value’?

Answer 7

Buildings are rated on their thermal efficency with this same measurement.

Question 8

What is the formula to work out heat conductivty?

Answer 8

W = Area (m) x U Vakue (w/m/K) x Temperature Difference

Question 9

When can convection take place?

Answer 9

In a fluid or gas.

Question 10

How does convection occur?

Answer 10

It occurs because when molecules are heated they heat and rise and then they are cool they fall.

Question 11

What is a joule?

Answer 11

Joule is the ammount of energy trasngered when a force of one newton acts on an object in the direction of the forces motion.