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Simple Circuits Require four basic components. 1. Conductor, like wires. 2. Voltage source, like a battery. 3. Load, like a lamp or a buzzer. 4. Control, like a switch. Simple Circuits Require four basic components. See schematic symbols below. Wire Buzzer Battery Switch Electron Theory of Current Current flows from negative to positive. + - Battery Direct Current DC Current flows from negative to positive only in one direction and never flows in the opposite direction. Batteries provide DC. + - Battery Alternating Current AC Current flows from negative to positive in one direction and then reverses direction when the polarity changes. Convenience outlets in the walls provide AC from power plants. + - Generator - + Generator