SUBMMITED BY : MOUTRISHNA GAYAN CLASS : VII ROLL. no : 9

Topic : symbolic representation Definition : In different field of life we use to represent different items, actions or events with a simple diagram, this pictorial representation is known as ‘symbol’. So, symbol means of symbolic representation : 1. The pictorial representations can be understand easily. 2. The symbols can be understand and learned by even illiterates or uneducated.

 3. In multi – lingllistic world the pictorial representation develops a universal language.  4. The pictorial representation emphasis on important expect of things.  Symbolic diagram of wire : the wire is most common thing used in electricity a required. The wire, made connecting material provides path for flow of electric current.  a)Wire joints : To expand the path of electricity a network of wire are inter – connected for the larger the joint of wire are represented in two ways.

 In first methods of symbolic representation the joints are represented with normal touch wire lines. In second method a dot is used to show the wire joints.  These way of representation effects of symbolic representation of wires overlapping.  b) Overlapping wires : The overlapping of wire means the wires are crossing each other but wires are not inter – connected.  In some cases the loops are used to represent the overlapping of wires.  In some cases where dots are used to represent the joints of wires, simple crossing of wires used to represent overlapping of wires.

 2. Cell : The are source of electrical energy and represented with symbol showing its two terminals.  3. Battery : The combination of two or more cells is called ‘battery’. The battery is represented as symbol shown in diagram.  4.Direct current supply : The electricity which the current flows in one direction.  5. Alternating current supply : In A.C electricity the direction of current and value of voltage keeps changing. It is represented by symbol of wave.  6. Switch : The switch is a device which is used to make or break the electrical circuit. Different types of switches used in electrical circuit.

8. Tube light : The tube light is an electrical devices, which is use to produce light with help of two other devices, named as - Starter. - Chock / ballast. a) Fan : The electric fan converse electrical energy into mechanical energy. 10) Motor : The motor is an electrical device which converts electrical energy into chemical energy.

11. Socket or wall outlet : The socket are open electrical points, which can be used to connect removable electrical appliances. There are two types of sockets. a) Two pin socket. b) Three pin socket. 12. Electrical terminals (in A.C) : There are three terminals in normal houses wiring or electrical system, which are called as – (a) phase – represented with ‘p’.

(b) Neutral – represented with ‘n’. (c) Earth – the terminal of earth is for safety purpose. 13. Fuse : The fuse is a safety device, which breaks the electric circuit when current flows more than the specified limit.