Question

Calculate the amount of heat generated in a conductor carrying, when a current of 2 A flows for 1 minute through a resistance of 100 ohm. (Given J=4200 joule/kcal)
50.7 kcal

5.71 kcal

51.2 kcal

26.7 kcal​

Answer 1

Answer:

The amount of heat generated in a conductor carrying a current of 2 A flows for 1 minute through a resistance of 100 ohms is 5.7Kcal

Explanation:

• We know that when current is passed through a conductor heat will produce in it, from joules law of heating we have the amount of heat energy produced $H=I^{2}Rt$

       where,

        H- the heat energy produced

        I- current given

        R- resistance

        t- the time taken

• use the conversion $1J=0.000239Kcal$

From the question, we have given that

current through the conductor $I=2A$

time of flow of current   $t=1mnt=60sec$

resistance of the conductor $R=100$Ω

the thermal energy generated is $H=4*100*60=24000J$

using the conversion formula we get $H=24000*0.000239=5.7Kcal$