Question

potential difference across 20 omega resistor is 20volt .what is the heat generated in the resistor in 1 sec________

Answer 1

Hey mate
your answer is here

current through resistor = 20/20 = 1 A

Heat
H = i^2RT

H = 1×20×1 = 20j

Answer 2

$Power =V^2/R*t\\\\Given,\\\\t=1s\\\\V=20v\\\\R=20ohm\\\\Heat=20^2/20*1W\\\\400/20\\\\=20W$