Question

electric iron has a rating of 750 w, 220 V calculate (I) the current passing through it and(2) its resistance when in use

Answer 1

Generally single phase power formula is P=VI

P stands for power of equipment , V stands for operating Voltage and I stands for flow of current in circuit.

In this case P = 750 watt and V =220 Volt

So I=P/V

750/220 = 3.40Amp.

In iron flow of current is 3.40 Amp.

Now according to ohm's law I is directly proportional to voltage if resistance and temp. Is constant . so V= IR

R stands for resistance of material.

So for finding R

R=V/I , 220/3.40

R= 64.60 ohm.
Hope this will help you
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Answer 2

I = 750/220 c/s ans r = (220)squre /750 ohm