Question

b) When a 15V battery is connected across an unknown resistor, 3.5mA current flows in
the circuit. Find the resistance of the resistor.​

Answer 1

Answer:

The resistance is 4.2*10³Ω

Explanation:

According to Ohm's Law,

The current flowing through a conductor is directly proportional to the potential difference applied across its ends provided the physical conditions like temperature remains constant.

Therefore,

V ∝ I

Equation is V = I*R( where R is the constant of resistance)

Given,

Current (I)=3.5 mA = 3.5*10⁻³ A

Potential difference (V) = 15V

From equation and substituting the same with the given values, we get,

V=I*R

15=3.5*10⁻³*R

R=15/3.5*10⁻³

R=150*10³/35

R=4.2*10³

Ans) 4.2*10³Ω