What happens when this current (overloading) increases greatly to the household circuit ?

Explanation

Electricity enters our homes through two wires called lines. These lines have low resistance and the potential difference between the wires is usually about 240 V.
2. All electrical devices are connected in parallel in our home. Hence, the potential drop across each device is 240 V.
3. Based on the resistance of each eletric device, it draws some current from the supply. Total current draw from the mains is equal to the sum of the currents passing through each device.
4. If we add more devices to the household circuit the current drawn from the mains also increses.
5. This leads to overheating and may cause a fire. This is called "overloading".