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250 V, 200 watts means that the current is (200W/250V) =0.8 amps (let us use DC now so that we don't have to deal with power factors and RMS / Peak voltages etc.). So, the resistance will be 250 / 0.8 = 312.5 ohms.
Wiki User
∙ 13y ago
Wiki User
∙ 6y agoA light bulb fixture consists of a "Hot" input screw, and a "Neutral" output screw.
The HOT screw consumes the incoming current from your main power source.
The NEUTRAL screw takes the current going through the bulb, and returns it back into your receptacle/wall outlet.
This process allows the current values to be maintained by a circuit fuse that determines the amount the circuit breaker receives, and knows whether the current flow is under the limit the breaker can handle, so it can send the incoming current flow back into the light bulb, and repeats.
Wiki User
∙ 14y agoThe 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.
Wiki User
∙ 13y agoLight bulbs don't "use" resistance to make light!
When current passes through resistance, the resistance heats up. A heated substance at high enough temperature produce emission, part of it is in visible light.
So light can be produced by blow torch, even by a speeding bullet on a steel plate, or an hammer on a rock, in this case a sparkle. The 'Color' of the light, the spectrum depends on the nature of the material being heated.
Wiki User
∙ 14y agoThe filament inside a bulb is a resistive heating element that glows brightly when the correct voltage is applied to it.
So the correct resistance is key to its operation
Wiki User
∙ 12y agoIt's the resistance that makes the heat that makes the glow that makes the light./
Wiki User
∙ 11y agobecause light bulbs just do
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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.
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 is cold resistance?
That is e.g. the resistance of a cold bulb before the bulb is lighted and heats up.
If their is more bulbs in a circuit does the resistance increase?
Yes. Each light bulb is just another resistor in a series circuit, where you add the individual resistances to get the total resistance (unless the bulbs are set up in parallel, where adding a second identical light bulb would cut the total resistance in half).
What will happen if a second bulb is added to a parallel circuit?
-- The voltage doesn't change. -- If the second light bulb is identical to the first, then the total resistance drops by half. -- If they're not identical, then we have to know the details of both before we can calculate their combined effective resistance.
What does a light bulb have?
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.
Is the material inside a light bulb a conductor or resistance?
It has high resistance.
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 is the resistance of the glass in a light bulb?
about 6.50 pounds
Why is there zero current when a light bulb out?
there is no voltage and resistance
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 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.
Why is there zero current when a light bulb burns out?
there is no voltage and resistance
How does a change in the size of a current affect the light output of a bulb?
The bulb has resistance which then gets smal
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.
The power delivered to the light bulb is 23.1 W. What are the two possible resistances of the light bulb?
A: HARD TO SAY because a bulb has different resistance as it warms up
