A soldering iron draws an energy of 43200J in 4min, when the current f

1.	A soldering iron draws an energy of 43200J in 4min, when the current flowing through its element is 6A, calculate the resistance of its heating element.
Answer» Energy draw E = 43200J, t = 4min. = (4 x 60)s. I = 6A R = E/I²t = 43200/(6 x 6 x (4 x 60) = 5Ω

A soldering iron draws an energy of 43200J in 4min, when the current flowing through its element is 6A, calculate the resistance of its heating element.

Answer»

Energy draw E = 43200J,

t = 4min. = (4 x 60)s.

I = 6A

R = E/I²t = 43200/(6 x 6 x (4 x 60) = 5Ω