Basics of Circuit for ODM service
You've probably heard these terms before. You knew they had something to do with electricity, but maybe you weren't sure quite sure how.
Just as your heart produces the pressure to make blood circulate, pcb assembly a battery or generator produces the pressure or force to push electrons around a circuit. Voltage is the force and is measured in volts (V). A typical flashlight battery produces 1.5V, and the standard household electrical voltage is 110V or 220V.
Electrical current, pcb assembly or flow of electrons, is measured in amperes (A). The product of electric force (in volts) and current (in amperes) is electrical power, measured in watts (W). A battery generating 1.5V and producing a current flow of 1A through a flashlight bulb delivers 1.5V·1A = 1.5W of electrical power.
The blood flowing through your body doesn't get a free ride. The walls of the blood vessels impede the flow, and the smaller the blood vessel, the more the resistance to flow. Some of the pressure produced by your heart is just for pushing blood through blood vessels. As electrons move through wires, they bump atoms. This impedes the flow of the electrons. The wire offers resistance to the flow of the current. The amount of resistance depends on the material, diameter and length of the wire. The resistance increases as the diameter of the wire decreases. Resistance is in units of ohms (Ω).
Electric circuits are composed of wires and other components -- like light bulbs, transistors, computer chips and motors. Wires, made of metals called conductors that have a low resistance to current, connect the components. Copper and aluminum are the most common conductors. Gold, because of its resistance to corrosion, is often used for attaching wires to tiny electronic chips.