Question

Plz solve my question :-An electric lamp of resistance 100ohm, a toaster of resistance 50 ohm and a water filter of resistance 500 ohm are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances and what is the current through it?

Answer 1

well, we use parallel circuit system here.
So the total resistance R will be given by:-
$1 \div r = 1 \div 100 + 1 \div 50 + 1 \div 500$
r comes out to be 500/16

Calculating current, by V=IR,
I is 176/25.

Since same source is used, V will remain 220V
since current is equal,
R=V/I again.

R comes out to be 22000/706 or 31.16 ohm

Answer 2

total current of circuit=current through electric iron
v=IR( where I=total current of the circuit and R=total resistance)
220=R×(2.2+0.5+5)
220=R×3.2
R=220/3.2
R=68.7 ohm