piece of resistance wire , 15.6m long and the cross sectional area 12mm sq. at a temperature of 0 degrees , passes a curent of 7.9 A when connected to DC supply at 240V. Calculate  a.) resistivity of the wire  b). the current which will flow when the temperature rises to 55 degrees celcius. The temperature coefficient of the resistance wire at 0degrees is 0.00029

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Hall Effect Sensors

The hall effect sensor is an electronic device designed to detect the effect of the hall, and converts its findings into electronic data, or opening and closing the circuit, providing a magnetic field measurement, processed by an embedded computer or displayed on a visual connector.