Question

How much heat will an instrument of 12W produce in 1 minute if it is connected to a battery of 12V?

Answer 1

we know that H=I^2rt
also I =P/V
I=12/12=1A
NOW V=IR
SO R=V/I=12/1=12
SO I=1A ,R=12Ohm ,T=60s
SO H=1×1×12×60
=720
Therefore heat produced is 730J

Answer 2

we know that H=I^2rt

also I =P/V

I=12/12=1A

NOW V=IR

SO R=V/I=12/1=12

SO I=1A ,R=12Ohm ,T=60s

SO H=1×1×12×60

=720

Therefore heat produced is 720J