Question

calculate the heat in calarie of 200 v pottential difference is applied across a resistance for 5 minute if the current is 3A​

Answer 1

Answer:

43.02 KiloCalorie

Explanation:

Given :

1. V = 200V
2. I = 3A
3. t = 5 min = 5 × 60 sec = 300 sec.

To find : Heat produced, i.e., H

Solution :

We know that,

$H = {I}^{2} Rt$

But we want R (Resistance).

So, we also know that, V = IR (from Ohm's law)

So,

$R = \frac{V}{I}$

So,

$R = \frac{200}{3}$

Now, We have,

$H = {I}^{2} Rt$

So,

$H = {(3)}^{2} \times \frac{200}{3} \times 300 \\ = 3 \times 200 \times 300 \\ = 180000 \: joule$

Now, converting it calorie :

We know that, 1 KiloCalorie = 4184 Joule

So, 180000 Joule = 43.02 KCal