Presentation on theme: "ENERGY TRANSFERS AND TRANSFORMATIONS. 2 different metals called electrodes ( anode (- terminal) and a cathode (+ terminal)), and the electrolyte ( usually."— Presentation transcript:
2 different metals called electrodes ( anode (- terminal) and a cathode (+ terminal)), and the electrolyte ( usually a dilute acid ). Batteries have three parts:
Transformation of Chemical to Electrical Energy in a Battery: The chemical reactions in the battery cause a build up of electrons at the anode. This results in an electrical difference between the anode and the cathode. The electrons want to rearrange themselves to get rid of this difference. Electrons repel each other and try to go to a place with fewer electrons (the cathode). The electrolyte keeps the electrons from going straight from the anode to the cathode within the battery.
When the circuit is closed (a wire connects the cathode and the anode) the electrons will be able to get to the cathode. the electrons go through the wire, lighting the light bulb along. Transformation of electrical energy to light energy in a bulb:
Heat Transfers: In our environment, heat transfers always move from hotter objects to colder objects Three types: conduction, convection, and radiation
Conduction: Transfer of heat between objects or substances that are in direct contact with each other Conduction works well in solids because the atoms are close together. For example: If you leave a metal spoon in hot soup, the spoon will soon be very hot, too.
Convection: The transfer of heat by movement through a medium, like air or a liquid. As a gas or liquid medium is heated, it warms, expands, and rises because it is less dense. When the medium cools, it becomes denser and falls. As the medium warms and rises, or cools and falls, it creates a convection current.
Radiation: The transfer of energy by electromagnetic waves. When a wave comes into contact with an object, the energy is transferred to the object in the form of heat. For example, you can feel the radiation from a fire in a fireplace all the way across the room.