Questions about alternating current

Things are different now from before; the reliability of power supply through the grid is very high. Of course, it is necessary to ensure that there is sufficient power capacity, so that there is enough headroom when using high-power appliances such as air conditioners and induction cookers, preventing circuit breakers from tripping and ensuring that the cross-sectional area of the wires is large enough. If it is in a rural area, it is advisable to install a voltage stabilizer, as the quality of the power supply there is poor; sometimes the voltage can rise above 300VAC due to phase loss, which can damage electrical equipment. What actually damages electrical appliances is not the voltage itself, but rather the increase in current that results from the rise in voltage. When the resistance remains constant, voltage and current are directly proportional to each other; an increase in current causes the appliance to heat up. When the temperature becomes too high and the heat cannot be dissipated properly, the appliance gets damaged. If we think about why this happens, there seems to be a logical connection. For example, high-power devices generally come equipped with cooling systems – in other words, devices that handle large currents usually have mechanisms for dissipating heat. Take electric motors, for instance: even if they operate at their rated voltage, they will still get damaged if they lack cooling fans and continue to operate for a long time! !