The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is

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An electric current is a flow of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is defined as the net rate of flow of electric charge through a surface. (Source: Wikipedia)

There are two kinds of current electricity: direct current (DC) and alternating current (AC). With direct current, electrons move in one direction. Batteries produce direct current. In alternating current, electrons flow in both directions.


The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is