CREATIVE MINDS: A girl from Mahabubnagar district explaining the concept behind automatic lighting system at State-level science fair in Guntur on Wednesday. — Photo: T. Vijaya Kumar

GUNTUR: There is something to learn from the exhibits of students for the gram panchayats and municipalities at the 38th State Science Fair being organised at Guntur and for people to pick up a tip or two to implement in their personal lives.

So captivating is the explanation of N. Lakshmamma, a student of Ninth Standard from ZP High School Nagilla in Mahabubnagar district, about Automatic Light Switching System of Street Lights at the fair at Pathibandla Seetharamaiah High School in Lakshmipuram that Room 17 with exhibits on the theme `Energy' has become the popular destination.

Saving of Rs. 72,000

A small relay switch using the Light Dependent (electricity) Resistance in a village or colony having 1,500 streetlights can save up to Rs.72,000 per month through savings in power bills and staff salaries, she explained.

When sunlight falls on a condenser of a relay switch, its resistance increases and disconnecting power supply to the system as a magnetic coil gets charged attracts one of the poles of a switch snapping the connectivity at the sunrise.

At the dusk when the resistance decreases, the coil loses its magnetic power and releases the node to restore the power supply to the streetlights.

Thus with the dawn lights get switched off automatically and municipalities need not employ people to switch off or on the lights.

These in turn save power and switch on the lights at the right time.

The Guntur Municipal Corporation proposing to install such a system in the city might find it interesting.

Production of E-85 a blended fuel of 15 per cent Hydrocarbon and Ethanol being explained by Darahasini and Srestha from Keshava Reddy Talent School, Kurnool, is educative with students providing good finish to their working model or extracting Ethanol from Maize.

`Missed call'

Look for this at Room No.10 in the exhibition that is open till Friday.

`A missed call' from cell pone can switch on or off your motorized pump in the fields, saving you from the dangers of getting an electric shock or snakebite and saving power/water in the process is on display that interests many elders as they find it useful even in urban settings to switch on or off their water pumps.

This is an exhibit of ZP High School from Kasapuram in Ananthapur district.

One will come across such interesting models at the exhibition where 973 students from 23 districts have put up 576 exhibits and 573 teachers are accompanying them.

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