Electric guitars have a much lower impedance than acoustic guitars, and amplifiers are designed to match the impedance of the instrument they are powering. When you plug an electric guitar into an acoustic amplifier, the impedance mismatch can cause the amplifier to overdrive, resulting in a distorted sound and potentially damaging the amplifier.
Acoustic amplifiers are designed to reproduce the natural sound of an acoustic guitar, and they do not have the same power and distortion capabilities as electric guitar amplifiers. Plugging an electric guitar into an acoustic amplifier can result in a thin, tinny sound, and it may not be able to handle the high output levels of an electric guitar.
If you want to use an electric guitar with an acoustic amplifier, it is best to use an attenuator or impedance matching device to reduce the signal level and impedance of the guitar to match the input of the amplifier. This will help to prevent damage to the amplifier and ensure that you get the best possible sound from your electric guitar.