Give the construction and working of an electic torch?
take 4 lengths of electric wire with differently colored plastic coverings.remove a little of the plastic covering from each length of the wire at the ends. this would expose the metal ires at the ends of each length . fix the exposed parts of 2 wires to an electric cells and the other two of the bulb.you can stick the wires to the bulb with the tape used by electricians. use rubber bands or tape to fix the wires to the cells. now connect the wires to the bulb with those attached to the cells
This is a well labelled diagram showing how a torch works. The electric power from the cells through the wire passes an reaches the poles of he bulb.You might see a metal strip attached under the switch. When the switch is in the 'ON' position the metal strip gets connected to both the wires and when the switch is in the 'OFF' position then the metal strip might get connected to one of the the wires or neither of them. THIS IS HOW A TORCH WORKS!!!
Hope it Helps!!!!
Torch – a Simple Circuit Apparatus a few cheap torches that can be taken apart Action The students take the torches apart, identify the components and draw a circuit diagram for the torch. They should try to identify the current path. The Physics The torch is a very simple circuit, containing only three components; a switch, a globe and a battery. The components are connected in series. The battery stores energy as electric potential energy, which is converted to light and heat by the globe, when the switch is closed to connect the circuit. For a current to flow and the torch to work there needs to be a complete circuit. In a metal cased torch the case itself often forms part of the circuit.
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