1. Tardigrade
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  4. An 1800 W toaster, a 1.3 KW electric fan and a 100W lamp are plugged in the same 120V circuit i.e. all the three devices are in parallel. What is the approximate value of the total current (i.e. sum of the current drawn by the three devices) through circuit ?

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Q. An $1800\, W$ toaster, a $1.3 \, KW$ electric fan and a $100W$ lamp are plugged in the same $120V$ circuit i.e. all the three devices are in parallel. What is the approximate value of the total current (i.e. sum of the current drawn by the three devices) through circuit ?

UPSEEUPSEE 2016

Solution:

Power consume
$P=P_{1}+P_{2}+P_{3}$ ...(i)
and $P=VI$
From Eq. (i), we get
$ P_{1}+P_{2}+P_{3}=VI$
$\Rightarrow (1800+1300+100) Watt =(120) I $
$\Rightarrow 3200 =120I$
$I=26.66\, A$
$\approx 27\, A$