P2 - Energy Stores And Transfers Flashcards
(40 cards)
What unit is used to measure energy?
Joules. (kJ is more common and is 1000 joules)
What is food?
A fuel we digest to transfer our bodies energy from the chemical stores of the fuel.
Why do our bodies need energy?
There is an energy cost for every action we take from sleeping to running.
What is energy?
It is a concept that in itself is invisible but can be perceived in its stores or transfers. Every action and existence is made by it.
What is the law of conservation of energy?
No energy can be created nor destroyed.
What is an energy store?
A build up of energy in an object of a certain type that alters the objects properties, actions or processes.
What is a chemical store?
The energy that is stored in compounds that upkeeps the chemical bonds the molecule has.
What is a thermal store?
A build up of energy that determines the temperature of an object.
What is a kinetic store?
A build up of energy which determines the direction and speed at which an object moves.
What is a gravitational potential store?
The potential value stored in an object which determines its kinetic store when the item goes into free fall whilst in agravitational field. The higher elevation, the higher the value.
What is an elastic potential store?
A potential value stored in an object which determines how much kinetic store an object undr stress will have when it is released.
What does it mean for energy to dissipate?
Dissipated energy is energy that leaves or enters an energy store unwantedly.
What is an electrostatic store?
A buildup of energy that is stored in an objects electrical field and charge. It decides how strong the field is at interactions and how much resistance it can overcome. (Potential difference)
What is a magnetic store?
A build up of energy around a magnet in the form of a magnetic field which can do work on magnetic materials and other poles. The store decides the fields strength.
What is an exothermic reaction?
A reaction that releases energy from a store.
What is an edothermic reaction?
A reaction which traps energy into a store. (Generally chemical)
What is a temperature?
The amount of heat or hotness an object has.
How is a thermal store different to a temperature?
A thermal store is what determines an objects temperature. However larger objects need more thermal stores to get less temperature so their correlation is not that simple.
What happens when objects heat up?
Their particles start to vibrate faster move faster. This is why ice is stationary while steam is not.
How does heat transfer work?
Energy from the thermal store of the higher temperature object will be transferred rapidly to the object with less temperature. It will keep happening until both are at the same temperature. (Equilibrium.)
What is an energy transfer?
A process that moves energy from one store of an object to a different store.
What is a mechanical transfer?
When kinetic energy from one store of an object is transferred to another one through either collisions or other potential sources such as magnetic fields.
What is an electrical transfer?
Energy transferred by the interactions of electrostatic field stores of charges otherwise known as potential difference.
What is conduction?
A process of energy transfer where heated regions of a material start to vibrate irregularly and collide with other regions. These collision transfer their heat over to that region. Repetition of this spreads out and moves heat along the material.
