Question

5} How much current will be drawn by an electric iron from a 260 V source if the resistance of its element when heat is 65.22 ? Calculate the wattage of electric iron when operates on 260 V.​

Answer 1

Explanation:

Given : V=220V,P

min

=360W,P

max

=840W

For minimum heating case:

We know that

P

min

=VI

360=220×I

I=1.63amp

R=V/I

R=220/1.63

R=134.96ohms

For maximum heating case:

We know that

P

max

=VI

840=220×I

I=3.81amp

R=V/I

R=220/3.81

R=57.74ohms

Answer 2

Given : V=220V,P  min = 360W,P  max  =840W

For minimum heating case:

We know that

P  min  =VI

360=220×I

R=220/1.63

I=1.63amp

R=V/I

R=134.96ohms

For maximum heating case:

We know that

P  max  =VI

840=220×I

I=3.81amp

R=V/I

R=220/3.81

R=57.74ohms