Electric Mechanic Question:

Tell us what is SF6 Circuit Breaker?

SF6 is Sulpher hexa Flouride gas.. if this gas is used as arc quenching medium in a Circuitbreaker means SF6 CB.

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Tell us what is the effect of positive feedback on stability of the system?	Suppose two bulbs of 100w and 40w respectively connected in series across a 230v supply which bulb will glow bright and why?