All electric devices are required to have identifying plates that specify their electrical characteristics. The plate on a certain steam iron states that the iron carries a current of 6.00 A when connected to a source of 1.20 ✕ 102 V. What is the resistance of the steam iron?
a. 0.0500.
b. 20.0.
c. 36.0.

b. 20.0

Explanation:

From ohm's law,

V = IR Equation 1

Where V = Voltage source, I = current carried by the iron, R = Resistance of the steam iron.

Make R the subject of the equation

R = V/I Equation 2

Given: V = 1.2×10² V, I = 6.00 A.

Substitute into equation 2

R = 1.2×10²/6

R = 20 Ohms.

Hence the resistance of the steam iron = 20 Ohms.

The right option is b. 20.0

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.