Question

When an electric soldering iron is used in a 110 V circuit, the current flowing through the iron is 2 A. What is the resistance of the iron?

Answer 1

Now we know by Ohm's law that

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

Introducing the constant of proportionality, the resistance,the Ohm's law can be mathematically represented as

V=I x R

Where V is the voltage measured in volts

I is the current measured in amperes

R is the resistance measured in ohms

Given:

I = 2 A

V= 110 V

Applying Ohm's law and substituting the given values in the above formula we get

V=I x R

110 = 2 X R

R = 55 ohms