The reason for incandescent lamp surge current when initially switched on is attributed to__________.
A) Lenz's law
B) CEMF
C) the positive temperature coefficient of tungsten
D) the negative temperature coefficient of tungsten

Question

Quizplus · Accepted Answer

The positive temperature coefficient of tungsten means that its resistance increases with temperature. When the lamp is first switched on, the filament is cold and has low resistance, leading to a surge in current. As it heats up, the resistance increases, reducing the current.

The Reason for Incandescent Lamp Surge Current When Initially Switched