Question

AN ELECTRIC IRON OF RESISTANCE 20 OHM TAKES A CURRENT OF 5 CURRENT CALCULATE THE HEAT DEVOLPED IN 30 SECONDS​

Answer 1

Given :-

• Current (I) = 5 A

• Resistance (R) = 20 Ω

• Time (t) = 30 sec

To find :-

• Heat developed in 30 sec

Solution :-

we know that,

$\gray{\bigstar}\:\:{\underline{\boxed{\bf\green{H={I}^{2}\times\:R\times\:t}}}}$

$\rm\longrightarrow\:H={(5)}^{2}\times\:20\times\:30$

$\rm\longrightarrow\:H=25\times\:20\times\:30$

$\rm\longrightarrow\:H=15000\:J$

Hence,the heat developed in 30 sec will be 15000 joules.

$\orange{\bigstar}\:\:{\underline{\boxed{\bf\pink{More\:Information}}}}$

➝ Heating effect of current :- when an electric current is passed through a high resistance wire like nichrome wire,the resistance wire become very hot and produce heat.This is called the heating effect of current.