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Does the resistance of a light bulb filament change after the light has been turned on?
The electrical resistance of a light bulb increases when it is turned on
As a resistor, the tungsten light bulb has a positive resistance coefficient.
This means that the electrical resistance goes up when the filament becomes hot.
For example, a 100 watt light bulb operated at 120 volts - it does not matter if it is AC or DC for this calculation - will have a resistance of 144 ohms when hot and draw .833 ampere.
When cold the filament typically has a resistance of only 10 ohms which increases as the filament heats up.
What else can I help you with?
Is resistance in the filament of a lamp essential or not?
Yes, the resistance of the filament of a light bulb is what generates enough heat to make the filament glow and produce light.
What did Joseph swan invent?
Joseph Swan invented the carbon filament because to see light back in the days. Which turned out to be a light bulb.
Why does a wire connected to a bulb not glow where as the filament of the bulb glows when the same current is passed through both connections?
It glows because the filament wire is exposed in a vacuum and electrically, the light is a high resistance load. You know the sparks you get when you rub two exposed hot electrical wires together? That's a dead short. Now, put that short in a vacuum where the wire can't oxidize, and presto! Incandescent light. The filament is made of tungsten, and tungsten has a very, very, very high melting point. It took Thomas Edison a long time to find it, but find it he did.
What is the filament used in tubelight-?
The type of filament used in tube light is that one which is thin and surrounded by an oblong metal shield.
What is an incandascent lamp?
Your standard light bulb where a filament is heated by a current passing through it. The heated filament then gives off light.
Does the resistance of a filament light bulb change as the bulb gets brighter?
Yes, the resistance of a filament light bulb increases as the bulb gets brighter. This is due to the increase in temperature of the filament, which causes the resistance to go up.
Is resistance in the filament of a lamp essential or not?
Yes, the resistance of the filament of a light bulb is what generates enough heat to make the filament glow and produce 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.
How does resistance within a light bulb filament produce light?
Resistance within a light bulb filament causes it to heat up due to the flow of electric current. As the filament heats up, it emits light and glows, a phenomenon known as incandescence. The intensity and color of the light produced depend on the temperature of the filament.
How does energy change when it passes through a light bulb filament?
When energy passes through a light bulb filament, it is converted primarily into heat and light. The filament's resistance causes the electrical energy to be transformed into thermal energy, which then emits light due to incandescence. Some energy may also be lost as infrared radiation.
Why does the filament become hot?
The filament becomes hot when electricity passes through it, due to resistance in the wire. This resistance causes the filament to heat up and emit light in an incandescent bulb.
What does the filament of a light bulb allows the light bulb to change electrical energy to?
The filament of a light bulb allows electrical energy to be converted into radiant energy in the form of light and heat. When electricity flows through the filament, it heats up and emits light through a process called incandescence.
Why is the current in an incandescent light bulb greater immediately after it is turned on than it is a few moments later?
The current in an incandescent light bulb is greater immediately after it is turned on because the filament has a lower resistance when it is cold. As the filament heats up, its resistance increases, which reduces the current flowing through the bulb.
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)
What are the effects of the resistance of a filament wire?
The resistance of a filament wire affects the amount of current passing through it and the amount of heat produced. Higher resistance leads to higher heat generation and light emission, resulting in brighter light. However, too much resistance can cause the filament to overheat and fail prematurely.
How is resistance used to create light in a tungsten light bulb?
Electricity creates heat when flowing through a resistor such as the filament in a tungsten light bulb, and, since the heat can not be readily conducted away in the near vacuum inside a light bulb, the heat eventually raises the temperature of the filament to a value that leads to radiation of light from the hot filament.
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.
