Question

electric iron has rating of 750 w to 220 volt calculate current passing through it ,
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.

Answer 2

Since, P = VI
Therefore, I = P / V
I = 750/220
= 75/22
Again, R = V/I
= 220 * 22 / 75
= 44 * 22 / 15
= 968/15
= 64.533333333