What are the effects of unregulated voltage to appliances?

NORMALLY UTILITY SERVICE VOLTAGE ARE NOT STABLE AND THE WORST THAT COULD HAPPEN IS TO BURNOUT OUR SENSITIVE EQUIPMENT OR APPLIANCES DUE TO OVER AND UNDER VOLTAGE AND FREQUENT FLUCTUATIONS. IF YOU ARE USING OLD BUT SENSITIVE APPLIANCES THE BASIC SOLUTION IS TO USE AUTOMATIC VOLTAGE REGULATOR. NOWADAYS MANUFACTURERS SOLVE THIS BASIC ISSUE BY PRODUCING AUTOVOLT INPUT RANGING FROM 90V TO 260V AND CAN BE USED WITHOUT WORRIES IN EITHER 110V OR 220V SYSTEM.