I suspect you mean a 24 volt 250 watt bulb running on a 12 volt supply.
If so, it will burn with a dull orange color. The exact color is uncertain, as the filament of an incandescent bulb is usually made of Tungsten, which has a high positive thermal coeficient of resistance. What that means is that as it gets brighter (hotter) the resistance increases drastically. It is however certain that it will burn cooler than it would on a 24 volt supply.
If you make the opposite change, a 12 volt bulb on a 24 volt supply, it will burn out with a very bright flash.
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Nothing would happen.
it wont do nothing i tried it at home and the fire turned of it is really dumb
If you were to put a bare wire belonging to anything in a glass of water, the electricity flowing through the wire would have no reason to continue to travel through the wire instead of dispersing in the water. The water offers less resistance, so the electricity flows through that instead of the wire. This is known as creating a short circuit, or a short, for short! With no electricity flowing through the bulb, it will turn off.
it can help us because if we dont have light bulb everything would be dark, like in our house just when its morning
If you push down on the homemade switch, it would complete the circuit and allow electricity to flow through the circuit. This would activate whatever device or component is connected to the circuit, such as a light bulb or a motor. The switch essentially acts as a gate that controls the flow of electricity in the circuit.