Atul buit a small house . He used well - insulated copper wires of good quality for wiring and switches, sockets and plugs too . He however , had a room - heater of poor quality . Once on a winter night he was sleepoing with his family in a closed room with the heater On. During sleep he was suffocated . Hence he woke up and found flames of heater on fire . His son Raghav got up quickly and switched off the main switch . He made a call to the fire brigade . The fire crew of fire brigade reached quickly and put off fire . Atul and his family thanked the firement .
How Atul.s heater was on fire ?

Explanation

The cause of fir was short -circuiting due to defective heater of poor quality .