How quickly can an electric switch operate?

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Electricity travels slightly slower than the speed of light, which is approximately 299,792 kilometers per second. The distance from Earth to the Moon is about 384,400 kilometers, meaning light takes roughly 1.28 seconds to travel this distance. Therefore, if a circuit is turned off at time t0, it would take about 1.28 seconds for the lamp on the Moon to illuminate after the circuit is completed, assuming no losses in the conductor. The time it takes for the lamp to illuminate depends primarily on the speed of light and the distance between the two points. In this scenario, the critical factor is the time it takes for the signal to travel from Earth to the Moon.
Eltahawy
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Suppose a hypothetical experiment consisting of a lamp that is situated some where on the moon connected to a battery some where on Earth through an ideal conductor(with no losses at all) assume that we turned off the circuit at some time t0 how long it takes for the lamp to illuminate
Or that time it takes depends on which thing ?
Sorry for bad English it's not my native language
 
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Electricity travels a bit slower than light. How long does it take light to get from the Earth to the moon?
 

Thread 'Why measure the speed of light in one direction?'

It may be shown from the equations of electromagnetism, by James Clerk Maxwell in the 1860’s, that the speed of light in the vacuum of free space is related to electric permittivity (ϵ) and magnetic permeability (μ) by the equation: c=1/√( μ ϵ ) . This value is a constant for the vacuum of free space and is independent of the motion of the observer. It was this fact, in part, that led Albert Einstein to Special Relativity.
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