v1=60;
i1=0.6;
r1=v1/i1;
disp("At point 1 the resistance of the lamp filament (in Ω) is"); disp(r1);
v2=120;
i2=0.8;
r2=v2/i2;
disp("At point 2 the resistance of the lamp filament (in Ω) is"); disp(r2);
disp("The curve does not obey Ohms law since a doubling of voltage from 60 V to 120 V does not result in a corresponding doubling of current. That is, the resistance is not constant-it increases at higher currents due to a heating effect");