Q1
What is the concept of the conservation of energy?
Energy cannot be created nor destroyed.
Heat pump is used to?
reverse the process
A device thata changes thermal energy into mechanical work is a?
Heat Engine
ΔU =
Q =
W=
ΔU = the amount of heat flowing into a system during a given process
Q = the net work done by the system
W= the change in the system's internal energy
Heat flows normally from higher temperature to lower temperature, it does not not require any external energy to occur.
Spontaneous process
What are the four cycle-stroke of a gasoline engine?
intake stroke, compression stroke, power stroke and exhaust stroke
What is the SI unit for Energy?
Joules (J)
Heat flow from lower temperature to higher temperature, it needs mechanical energy to happen.
Non-spontaneous process
Heat engine is a device that changes thermal energy into.
Mechanical work
The first Law of Thermodynamics is expressed as?
ΔU = Q – W
What is the Second Law of thermodynamics
the total entropy of an isolated system can never decrease over time, tending to increase to a maximum value as all parts reach thermal equilibrium.
A heat engine consists of a gas confined by a?
Piston in chamber
What is Internal energy?
Are the sum of molecular kinetic energy and the molecular potential energy
What is heat pump?
Is a device that reverses the direction of the heat flow: from a cold reservior to a warmer one.
When the gas has heated, the piston moves?
When it is cooled, the piston moves?
Up
Downward