A galvanometer can be used to measure the direction and the magnitude of small electric currents. Electric circuits are represented by using neatly drawn schematic diagrams. Block diagrams and pictorial diagrams are also used. A schematic diagram is a plan or a design which represents components and their relationship to one another by symbols. By convention, certain symbols are used on schematic diagrams to represent different elements.
Schematic diagrams show how the elements in an electric circuit are connected.
Schematic diagrams are useful for troubleshooting or repairing electric circuits. They are also used to design new circuits. State the main ideas in the fundamental law of electric charges. State the SI unit for electric charge. State the SI fundamental unit for current.