How and Why do electrons make something move or start (in terms of electricity or electric charge)? I mean how refrigerator, machines etc. work when we apply potential difference to it.
Answers
Answer:
a charged particle in an electric field. The amount of work required to move a charge between to points or the work per unit of charge is called the 'electric potential difference' between the two points. The unit of potential difference is called the volt. Potential difference can be either positive or negative depending on the movement of the charge.
To move charges we need a device that can do work. Such devices include: batteries, generators, thermocouples and batteries.
Explanation:
According to the Second Law of Thermodynamics, heat will always flow spontaneously from hot to cold, and never the other way around. A refrigerator causes heat to flow from cold to hot by inputting work, which cools the space inside the refrigerator. It does this by following the steps below, which can be somewhat visualized with help from Figure 1
1. Work is inputted () which compresses a coolant, increasing its temperature above the room's temperature.
2. Heat flows from this coolant to the air in the room (), reducing the temperature of the coolant.
3. The coolant expands, and it cools down below the temperature inside the refrigerator.
4. Heat flows from the refrigerator to the coolant (), decreasing the temperature inside.