Energy

Question 1

What is heat?

Answer 1

The amount of thermal energy an object contains

Question 2

What is temperature?

Answer 2

How hot or cold an object is

Question 3

What is radiation?

Answer 3

The spread of thermal energy through the air

Question 4

What temperature does water boil?

Answer 4

100°c

Question 5

What temperature does water freeze?

Answer 5

0°c

Question 6

Give an example of energy transfer

Answer 6

Electricity-light
Electrcity-heat
Light-electricity

Question 7

What is insulation?

Answer 7

Insulation is keeping thermal energy on or out of an area

Question 8

What is convection?

Answer 8

The law that hot air goes up and cold air goes doeb

Question 9

A 2kw oven is used for 5 hours. The electricity company charges 8.7p per kwh. How much does it cost to use the oven?

Answer 9

2kw x 5h=10kwh

10kwh x 8.7p=87p

Question 10

Is black a good radiator?

Answer 10

Yes

Question 11

Is silver a good radiator?

Answer 11

No

Question 12

Is white a good radiator?

Answer 12

No

Question 13

Power(watts:W) =?

Answer 13

Energy(Joules:J) ÷time(seconds:s)

Question 14

Why is trapped air a good insulator?

Answer 14

It can absorb thermal energy