a coil develops heat of 800 cal/sec .when 20 volts is applied across its ends.what is the resistance of coil?
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Power dissipated by a resistor coil = P = I^2 * R = V^2 / R
V = voltage across resistor, I = current thru the resistor and R = resistance
R = V^2 / P
R = 20^2 / [ 800 cal /sec * 4.184 Joules/cal ]
= 0.1195 ohms
V = voltage across resistor, I = current thru the resistor and R = resistance
R = V^2 / P
R = 20^2 / [ 800 cal /sec * 4.184 Joules/cal ]
= 0.1195 ohms
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