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Flow of electrons from one place to another. Advantages of circuit diagrams Quicker to make Connections between the components are easier to see. Symbols are standerised. Digital sensors A digital sensor is an electronic or electrochemical sensor, where data conversion and data transmission are done digitally. capacitors Although the ability to store some electrical energy is common, devices called capacitors are purposely designed to store large amounts of electrical energy. Symbols used in circuit diagrams Justify the flow of electrons in conductor There are many materials that allow charges to move easily. They are calledconductors. Conductors have the quality of conductivity Conductivity is a quality related to the conductor. A material that is a good conductor gives very little resistance to the flow of charge. This flow of charge is called an electric current. A good conductor has high conductivity. Zig zag movement of electrons Resistance Resistors A resistor is anything that electricity can not travel through easily. When electricity is forced through a resistor, often the energy in the electricity is changed into another form of energy, such as light or heat. The reason a light bulb glows is that electricity is forced through tungsten, which is a resistor. The energy is released as light and heat. Variable resistor buzzers Fuses and circuit breakers. The fuse breaks the circuit if a fault in an appliance causes too much current flow. This protects the wiring and the appliance if something goes wrong. The fuse contains a piece of wire that melts easily. If the current going through the fuse is too great, the wire heats up until it melts and breaks the circuit.