Question

find out the heat developed in 3 minutes by a resistance 920 working under 230v​

Answer 1

Answer:

V=230 V

R=920 W

t=3×60 sec

I=

R

V

=

920

230

=0.25

H=I

2

Rt=0.25

2

×920×2×60=10350 J

Answer 2

Answer:

Here is your answer

Step-by-step explanation:

t = 3 mins , r = 920 ohms , v = 230v

we know that  h = v²÷r x t

Substituting we get,

= 230 x 230 ÷ 920 x 3

= 172.5 J