When is the resistance of the filament of a lamp is the greatest and the lowest?

resistance of metals increases with increasing temperature, and the filament of a lamp follows this rule.

So when it is cold, when you first switch it on, the resistance is lowest and the current is highest, and the power is highest. As it gets hot, the resistance goes up, and when it is at full operating temperature, the resistance is at it's max, and the current is at it's minimum, as is the power.

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the main considerable clarification for the present surge while first switched on is with the help of the fact the Tungsten filament is chilly. while tungsten is chilly it has a low resistance, and for that reason the present is severe - through fact the filament at as quickly as warms up, the resistance will advance at as quickly as, lowering the present point. If I = V / R ----- you will discover that if R is small, V would not substitute and as a result I is sizable. As R increses I will become smaller. that's the main considerable reason a bulb will blow once you first swap it on.....