Answer :
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