Emergency Light

AIM 

To set up and study the working performance of an emergency light using SCR.

COMPONENTS AND EQUIPMENTS REQUIRED

• Transformer (230V/6V-0-6V), 1A
• capacitor: 4.7uF/63V
• Diode: 3x 1N4001
• battery: 6V/ 4.5Ah
• Resistors: 220 ohm, 2.2 ohm (2W),
• Bulb: 6V
• SCR: 2P4M
• connecting wires
• bread board and multimeter

THEORY:

 It will maintain constant charge across the battery and supply energy to the lamp. When supply is there the battery get charged through D3 and R with current determining resistor. When supply stop SCR turn on by battery voltage its switch is manually turned on, the bulb glow. The input is given to the primary of the circuit is a dc voltage. Then the battery charged by diode D3 and resistor R and also glow the bulb by input supply voltage if turning on the switch. When the battery is charged constantly at 6V and the input supply voltage is removed then the SCR is turned ON. Its switch is manually turn ON hence the lamp is turned On by battery voltage.

PROCEDURE

•  Check the all given components using multimeter and set up the circuit on the breadboard as shown in figure. 
• Connect the 230V power supply to the circuit through step down transformer. 
• Check the glow of bulb when ON the power supply and OFF the power supply. 
• Verify the glowing of bulb using battery. 

CIRCUIT DIAGRAM

RESULT:

Studied and constructed the emergency light using SCR and verified the glowing of bulb.