Question

An electric iron drawing 9 a from 120 v supply mains is operated for 20 minutes, the energy consumed is

Answer 1

An electric iron drawing 9A from 120V supply mains is operated for 20minutes .
e.g., current , I = 9A
voltage , V = 120V
time taken, t = 20min = 20 × 60 = 1200 sec

we know, energy consumed in case of electric current is given by, $E=VIt$

so, energy consumed, E = 120 × 9 × 1200
= 144000 × 9
= 1296000 J