ABSTRACT
The schematic symbols are shorthand symbols used to represent components in electronics. This chapter shows how to control the flow of charge and some of its applications. Alternating current (AC) current is used to transmit electrical power over long distances. The reason is that unlike direct current power, an AC voltage can be easily raised or lowered using a transformer. The big, gray cylindrical objects on the phone poles are transformers. Semiconductors are materials that fall somewhere between the conductivities of conductors and insulators. Different types of semiconductors can be put together in various combinations to either enhance or limit the flow of current, such as in the case of transistors or diodes. The amp-hour rating of a battery is how much charge a battery can store. How much charge a battery can store is determined by its amp-hour rating. The value of the resistance is determined by controlling the concentration of this scattering material in the resistor.
