A power surge is nothing but a sudden increase in the voltage, which exceeds the standard level of 240 volts. It causes an abnormal spike in voltage that lasts only for a shorter period. This is harmful to electrical devices and appliances at home and can damage them. The contributing causes are high-powered devices, faulty wiring, lightning strike, or even a problem with the equipment of your utility company. You may not realize it until the electronic devices at your home stop working suddenly. Your home may experience hundreds of electrical surges every year, sometimes without any damage. Just like in the bulb filament, the power surge heats wires and components in your electronics and causes them to burn out. Even if the surge does not break your device, it can put additional stress on the internal components of the appliance and eventually cause it to fail.