Which of the following lamp has the least capacity to sustain voltage fluctuations?
Incandescent lamp has the least capacity to sustain voltage fluctuations.
Incandescent lamps have the least capacity to sustain voltage fluctuations compared to other lamps like sodium vapor, fluorescent, and mercury vapor lamps.
This is because the filament in an incandescent lamp is made of a thin wire that is heated to a high temperature by passing an electric current through it.
When the voltage of the electric current fluctuates, the temperature of the filament fluctuates as well. If the voltage drops too low, the filament can cool down too much, and the lamp may not produce enough light.
If the voltage is too high, the filament can overheat and burn out quickly.
This makes incandescent lamps more susceptible to voltage fluctuations than other types of lamps.