The current through the heater is 8 A if potential difference is increased to 120 V.
Explanation:
That is, V ∝ I
⇒ V = IR where R is the constant of proportionality called resistance.
R = V/I = 60/4 = 15 ohm
I = V/R = 120/15 = 8 A
Answer:
Given
Length of cylinder
diameter of cylinder
Area of cross-section
current
R is also given by
where