Question

two resistances of 20 W and 40 W are connected in serirs to a battery of potential difference 10 volt compare the ratio of heat produced in one minute in the two resistances​

Answer 1

20w+40w=60w

and 10v

we know that

r=i/v

r=60/10

r=6ohm

and t=60/6=10second

Answer 2

Here,

Power,P = 20W + 40W

= 60W

Potential difference,V = 10V

We know,

P = V×I

60W= 10× I

I = 6A

Now,

Current,I = 6A

Potential difference,V = 10V

and, time taken, t = 1min/ 60sec

Now,

Heat produced,H= V×I×t

= 10×6×60

=3600J