What resistance does a light bulb have?

Answer 1

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.

Answer 2

A 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.

Answer 3

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.

Answer 4

Light 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.

Answer 5

The 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

Answer 6

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

Answer 7

because light bulbs just do