Energy resources

Question 1

What is spefic heat capacity ?

Answer 1

Specific heat capacity – energy required to increase the temperature of 1 kilogram with 1 degree.

Question 2

kevin and celsius

Answer 2

-273 C = 0 K

Question 3

Why is pressure 0 when there is no temp

Answer 3

o When we heat ,the particles move randomly but with higher average speed
o Collide with the walls
o Pressure increases
o At absolute zero ,the particles have no thermal or movement energy so they cannot exert pressure .

Question 4

How does a speaker work ?

Answer 4

o Electric current from source through coil pf speaker
o Currents change in size and direction
o Permanent magnet + field of coils = magnetic field pattern
o Apply forces to the wires which causes cones to vibrate

Question 5

How does an electric motor work ?

Answer 5

1.Split ring commutator which swaps the positive and negative terminal every half turn
which switches the current every half turn so that forces will be acting in the same direction and will rotate in same direction .clockwise

Question 6

How does a transformer work ?

Answer 6

1.Iron core
2. PCoil has alt potential difference causing a current to flow and generates a magnetic field around the coil
3.Induces magnetic field around iron core
4.Induces potential difference in SCoil
5.Causes a current to flow