Can I plug 250v into 240v?
The 250V is the maximum voltage for which you should use it. What will happen if you connect a 250v cable in an amplifier 220-240v? If you live in a country where the main line provides 220 - 240V, the amplifier will work in the amount of power (Amps) that the cable can handle. The 250V is the maximum voltage for which you need to use it.