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 ?

Question

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 ? (A) 18 A (B) 27 A (C) 40 A (D) 120 A

Tardigrade Admin · Accepted Answer

Power consume P=P1+P2+P3 ...(i) and P=VI From Eq. (i), we get P1+P2+P3=VI ⇒ (1800+1300+100) Watt =(120) I ⇒ 3200 =120I I=26.66 A ≈ 27 A

Q. An $1800 W$ toaster, a $1.3 K W$ electric fan and a $100 W$ lamp are plugged in the same $120 V$ 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 ?

$18 A$

$27 A$

$40 A$

$120 A$

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

Q. An 1800W toaster, a 1.3KW 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 ?

18A

27A

40A

120A