This is an image showing the circuit of emergency lamp. Emergency lamp has a metal body and it has step down transformer, battery, electromagnetic relay, beam light, indicating lamp, bridge rectifier, toggle switch and a socket.
When power supply is switched ON, voltage reaches the bridge rectifier. This rectifier coverts AC to DC and passes it to electromagnetic relay. As long as the power supply is switched ON, contact of relay remains open and it charges the battery. When power supply is turned OFF, relay is closed. When first switch is turned ON, relay light up the upper filament of deem lamp. When second switch is switched ON, lower filament of lamp is light up. This gives full brightness of light.
It is used as one of the appliances in home, small workshops and industries.
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