P2

Question 1

examples of materials that are good conductors

Answer 1

Gold, Silver, Copper, Aluminium, Iron

Question 2

how does conduction occur in solids

Answer 2

When part of a solid absorbs heat energy the atoms vibrate faster and with bigger amplitude.

Question 3

whats thermal conductivity

Answer 3

measure of its ability to conduct heat.

Question 4

a practical to investigate the thermal conductivity of 3 metals

Answer 4

experiment where u put the different pieces of metal over a bunsen and put blue tack on the end with pins on

Question 5

whats specific heat capacity

Answer 5

quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree (joules)

Question 6

equation for energy transferred

Answer 6

Energy transferred = power x time.

Question 7

the 4 methods of insulating the home

Answer 7

carpets
curtains
double glazing
cavity wall insulation

Question 8

whats payback time ?

Answer 8

is a measure of how cost-effective it is.

Question 9

equation for payback time

Answer 9

amount to be invested / estimated annual net cash flow.

Question 10

a practical to investigate how the thickness of insulation affects heat loss

controlled variable

independent

dependent

Answer 10

fill a cup with warm water and dont put an insulator on

do it with another cup with material wrapped around

read the temperature every 30 seconds for 5 mins

controlled = volume + temperature of water,
thickness of material
independent = insulating material
dependent = the temperature of water decrease