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Light bulb filaments glow rather than burn because of the lack of oxygen within the vacuum of the bulb. Over time, the heating and contracting of the filament and the glass surrounding it creates a leak in the base of the bulb causing the vacuum to be lost and allowing oxygen to enter the bulb. It is during the contracting phase, which happens as the bulb cools after being turned off, that eventually the seal is lost. When this happens, oxygen is allowed to enter and the next time the bulb is turned on, the filament, now exposed to the oxygen, burns out.
What else can I help you with?
What uses more electricity a lit light bulb or an empty socket of the same rating switched on?
When the bulb is lit it uses energy. When there is no bulb, no energy is used even if it is switched on.
If you change a bulb in a circuit and the current decreases what is different about the new bulb?
The resistance of the new bulb is likely higher than the previous bulb. Increasing resistance in a series circuit decreases current flow. When resistance increases, less current can flow through the circuit, resulting in a decrease in current.
Will the bulb light if the filament is broken Why?
No, the bulb will not light if the filament is broken because the filament is the part of the bulb that creates light when electricity passes through it. Without a functioning filament, there is no source of light in the bulb.
What will happen when a 15v current flows through a 6V bulb?
It will glow VERY BRIGHTLY for a few seconds - and then burn out.
Does current direction matter when lighting a light bulb?
No. In fact, if the light bulb is powered by alternating current (AC), as almost allhousehold lights are, then the current is changingdirection 100 or 120 times asecond anyway.
What happens when the torch is switched on?
current flows and we have light from bulb....
Why do light filament bulbs usually blow when they are first switched on?
because when they are first switched on a large surge of electrical current flow through a cold filament. When you first switch on the bulb the resistance is small, so you get a current surge which breaks the weakened filament. The filament is weakened by repeated heating and cooling from the bulb being turned on and off; which makes it brittle.
What happens when a bulb is switched on?
when a light bulb is switched on it will blown..............
Why does electric bulb become dim when electric heater in parallel circuit is switched on?
The electric heater draws some of the electrical current in the circuit, which reduces the current available for the electric bulb. This leads to a decrease in the brightness of the bulb as it is receiving less power.
What uses more electricity a lit light bulb or an empty socket of the same rating switched on?
When the bulb is lit it uses energy. When there is no bulb, no energy is used even if it is switched on.
Two bulb are connected in parallel one bulb glows brightly and other is dim what do you say about their current?
The bulb that glows brightly likely has a higher current passing through it compared to the dim bulb. This could be due to differences in resistance, voltage, or power ratings of the two bulbs.
Meaning of 60watt's in 60watt's bulb?
60 Watts is the amount of electrical power the bulb uses when it is switched on.
If you change a bulb in a circuit and the current decreases what is different about the new bulb?
The resistance of the new bulb is likely higher than the previous bulb. Increasing resistance in a series circuit decreases current flow. When resistance increases, less current can flow through the circuit, resulting in a decrease in current.
Will the bulb light if the filament is broken Why?
No, the bulb will not light if the filament is broken because the filament is the part of the bulb that creates light when electricity passes through it. Without a functioning filament, there is no source of light in the bulb.
Which circuit was the light bulb the dimmest?
The light bulb was likely the dimmest in the circuit where it had the highest resistance, creating more opposition to the flow of current, resulting in less brightness.
Does an energy saver coiled bulb continue to flicker when switched off?
no
What type of energy is stored in a Bulb?
Light energy is stored in a bulb when it is switched off. When the bulb is turned on, electrical energy is converted into light energy and heat.
