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Why does the resistance of a filament bulb depend on the current in the bulb?
Wiki User
∙ 10y ago
The resistance of a piece of wire changes with temperature. In a filament bulb the wire is heated to about 3000 degrees C so a large change in resistance can be expected.
A 240 v 105 w halogen bulb has a cold resistance of 35 ohms, but when running its resistance is 549 ohms.
Wiki User
∙ 10y ago
Wiki User
∙ 13y agoIt will affect the current because of the resistance that's increasing through the flow.
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What does the filament of a light bulb allows the light bulb to change electrical energy to?
The filament of a light bulb overs enough resistance to current flow, that the filament heats up so much that it will glow and produce visible light.
Is a light bulb a soure of light?
Yes, a light bulb is a source of light. When current is going through the filament the resistance generates enough heat that the filament glows, producing light.
There are three bulbs of 600W 100W and 200W which bulb has thickest filament?
600w - the thicker filament has a lower resistance, which leads to a higher current and thus higher wattage
How much current will an electric bulb draw a 220v source if the bulb filament is 1200ohm?
The equation that you are looking for is I = E/R. Amps = Voltage/Resistance in ohms.
What is the thin coil of wire inside a light bulb called?
If you are talking about an incandescent light bulb then its called a filament. It is thin so that it has a high level of resistance. Current going through the filament causes it to heat up and give off EM radiation in the spectrum of visible light.
When the bulb is the resistance what this tells about the resistance?
An incandescent bulb has a filament that has a resistance. The value of the resistance determines the current that will flow for a given supply voltage. The heat generated by the current flowing through the filament gives off light. As the resistance of the filament decreases the current increases and you get more light.
Which has the thickest filament - a high-resistance or a low-resistance bulb?
A low resistance bulb has a thicker filament.
What was a resistance invention?
The incandescent light bulb. The tungsten filament lights due to it's resistance of the current flowing through it.
What does the filament of a light bulb allows the light bulb to change electrical energy to?
The filament of a light bulb overs enough resistance to current flow, that the filament heats up so much that it will glow and produce visible light.
What is the general resistance of a tungsten filament?
The resistance of the filament in a light bulb is(voltage at which the bulb is designed to operate)2/(the rated power/watts of the bulb)
Is a light bulb a soure of light?
Yes, a light bulb is a source of light. When current is going through the filament the resistance generates enough heat that the filament glows, producing light.
What is the purpose of the filament inside the light bulb?
The filament is a special metal composition of tungsten that conducts current and heats up and emits light as a result of the current and its internal resistance.
Do light bulbs use more energy over time?
An incandescent light bulb is essentially a wire through which current flows. The wire gets heated up and glows giving off light. According to Ohm's Law Volts = Current x Resistance. In this case resistance is the resistance of the filament. Since in a residence the voltage remains more or less constant, the way more energy would be use is if more current passed through the filament. If the resistance of the filament decreased then the current would increase. Not sure how an aging bulb would have a decreased resistance. If this were somehow possible such that the composition of the filament changes and reduced resistance then the energy required to operate the bulb would increase.
Why does a bulb glow when electric passes through it?
The filament in the bulb has resistance. The current flowing through the resistance of bulb causes the filament to dissipate energy in the form of heat and light. The filament is actually glowing white-hot because of the energy it is dissipating, thus giving off light.
There are three bulbs of 600W 100W and 200W which bulb has thickest filament?
600w - the thicker filament has a lower resistance, which leads to a higher current and thus higher wattage
How much current will an electric bulb draw a 220v source if the bulb filament is 1200ohm?
The equation that you are looking for is I = E/R. Amps = Voltage/Resistance in ohms.
Why does the light bulb not work when the filament is broken?
A light bulb works by passing an electric current through the filament, which is usually made from a high resistance substance such as tungsten. When the current flows through, the filament glows which produces the light. When it burns out, no electricity passes and no glowing occurs. Source: i just know
