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What resistance does a light bulb have?


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Answered 2010-04-07 16:37:37

The resistance of a light bulb varies, depending on the type of bulb, the power rating, and the temperature. A typical incandescent 60 watt bulb, for instance has a cold resistance of about 30 ohms, and a hot resistance of about 240 ohms.

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Related Questions

How does the resistance of a light bulb change?

As the bulb gets hotter, the resistance increases.


How does the resistance of a tungsten light bulb compare to the resistance of a copper wire?

The resistance of a tungsten light bulb is greater than the resistance of a copper wire. In addition, as the bulb get hotter, the resistance increases, due to the positive resistance to temperature coefficient of the filament.


Which has more resistance a 100 Watt light bulb or a 75 Watt light bulb?

A 75 watt light bulb has more resistance because less current is going through which causes less light.



Where is the resistor of an light bulb?

It is the tungsten element in a filament light bulb that is the resistor. It is this resistance that produces light and heat.


Why does a light bulb have high resistance?

It's the resistance that makes the heat that makes the glow that makes the light./


How would you make a bulb in a circuit shine with a fainter light?

If you add resistance to the circuit the bulb will shine with a fainter light ... the higher the resistance is the fainter it will shine


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)



Why do light bulbs give off light?

The high resistance of the filament in a light bulb causes the light bulb to heat and give off light. :)


What increases when you add a bulb to a circuit?

The resistance of the circuit increases when you add a light bulb. For the same voltage, the current will decrease as you add the light bulb. Ohms law: voltage = current x resistance.


The brightness of a light bulb is determined by its filament's?

The brightness of a light bulb is determined by its filament's resistance.


A current of 0.83 A flows through a light bulb in a 120 volt circuit what is the resistance of this light bulb?

Voltage is equal to current over resistance. V=I/R which means that the resistance should be .0069167 ohms.


How 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.


Explain how the resistance of a light bulb filament changes 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.


Plug 120V light bulb in 240V socket?

The result is depend on the capacity and the type of the bulb, if the bulb is made of the material which have the high melting point and it have the high resistance then the bulb will light and if the bulb can't afford the voltage means the resistance of is not to much high or the area of the filament is thin then the bulb will light for 1 or 2 sec after that the filament will break and the bulb will not be able to light again.


What part of a light bulb has the most resistance?

the actual filament itself in a light bulb has the most resistance,this is why it glows and produces light,the rest of the bulb is sufficiently engineered to carry the voltage and current applied to it without producing too much heat.


How is the brightness of a light bulb determined?

Brightness of a light bulb depends on the power, current, resistance and size of the filament. Lumens is the unit of measurement for the brightness of a bulb. A bulb has more brightness if there is more power and current. Greater the resistance, less is the brightness.


Does the resistance of a light bulb filament change after the light has been turned on?

Yes. The resistance of a light bulb filament increases as it gets hotter. It is not unusual for a bulb's cold start power to be ten times its running power. A typical incandescent 60W bulb may have a cold resistance of 30 ohms, 500W, with a hot resistance of 240 ohms, 60W.



Why are high resistance materials useful in light bulbs?

The filament in a light bulb causes the light bulb to heat up and give off life.


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.



Relationship between current and brightness of a light bulb?

the higher the current the brighter the bulb and the lower the resistance.


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.


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