Question

The current flowing through a resistor connected in an electric circuit and the potential difference developed across the ends of it are as shown in the diagram. Find the resistance of the resistor.

• A. $0.024\Omega$
• B. $17.5\Omega$
• C. $0.057\Omega$
• D. $24\Omega$

Answer 1

The correct option is B $17.5\Omega$

From the given diagram,
Potential difference developed across resistor ends, $V=7V$.
Current flowing through the resistor
$I=400mA=400\times {10}^{-3}=0.4A$
Using Ohm's formula, $V=I\times R$
$\Rightarrow$Resistance, $R=\frac{V}{I}=\frac{7}{0.4}$
$\Rightarrow R=17.5\Omega$.