Question

find the heat devolped in 4 minute by a device of resistance 930 ohm working under 230v​

Answer 1

Explanation:

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