Why does the filament in a light bulb offer much more resistance than copper wire?

Why is a copper wire not used in the filament of a bulb?

Copper wire cannot be used to create an electrical bulb filament, because copper wire has very low resistance. Therefore, the light does not shine until the current is removed. It will also melt-the filament must be white-hot for any application.

Why do light bulbs have high resistance?

If you take a bulb and increase the voltage across it, the current increases too. An increase in current means the bulb gets hot—hot enough to glow. As the temperature increases, however, the resistance also increases.

Why is a copper wire not used in the filament of a bulb what will happen if we use a thick tungsten wire in an electric bulb?

1. Its melting point is lower than tungsten and at high temperature the copper will melt. … Resistivity of tungsten is higher than copper. If we use a thick tungsten wire in the electric bulb , then the resistance will get reduced and to achieve the requisite heat, more energy will be spent.

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How is a filament of the bulb different from connecting wires?

The wire in the filament of a light bulb has a high resistance and a high melting point. So, it heats up without melting and glows when the current flows through it. The connecting wire in a circuit has a low resistance and a low melting point.

Can a copper wire be used to make the filament of an electric bulb?

copper wire cannot be used as a filament in an electric bulb.

Why can’t we use copper to make filament of an electric bulb instead of tungsten give two reasons?

No, we cannot use a copper wire instead of a tungsten wire to make the filament of an electric bulb because the melting point of tungsten is very high unlike copper wire. So, copper wire can easily melt and the bulb will easily and soon get fused.

Do bulbs have high resistance?

Incandescent light bulbs have a small filament which when heated begins to glow and emit light. The reason the filament heats up is because it has a high resistance, which means that as electrons move through the filament, they lose a lot of energy.

How does resistance affect light bulb?

An incandescent bulb’s brightness depends on a whole lot on resistance. The higher the resistance to current in the wiring, circuitry, and bulb, the lower will be the current, lower the power, and lower the brightness. Conversely, lower resistance means more brightness.

What would happen if the filament of a bulb was made of copper?

No, copper wire cannot be used to make the filament of an electric bulb as copper wire has very low resistance. Therefore, the bulb will not glow if current is passed. It would also melt – the filament has to be white-hot to be any use!

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Can you use a copper wire to make the filament of an electric bulb Why Class 7?

Answer: Filament of an electric bulb is made up of conductors that offer high resistance to electric current. Copper wire cannot be used in filaments because it offers very little resistance.

What will happen if we use a thick tungsten wire in an electric bulb?

So if the filament is thicker the bulb will not glow as brightly as a thinner filament. IF WE USE A THICK TUNGSTEN WIRE AS THE FILAMENT OF THE BULB, THEN THE ELECTRIC CURRENT PASSES THROUGH THE METAL AND GIVES OUT A BRIGHT YELLOW LIGHT, AS ITS A GOOD CONDUCTOR OF ELECTRICITY.