Question

(a) If potential at point 'A' is 5V and at point B is 3V
(b) If potential at A and B is 5V
(c) If potential at A is 10V and at B is -2V
find the current in each case.

Answer 1

By using ohm's law $I=\frac{V}{R}$ in this where V is potential diffrenece between A and B

$V=V_A-V_B$

(a) $V_A=5V,V_B=3V$

$\Rightarrow V=V=V_A-V_B=5-3=2V$

$I=\frac{V}{R}=\frac{2}{10}=0.2A$

(b) $V_A=5V,V_B=5V$

$\Rightarrow V=V=V_A-V_B=5-5=0V$

$I=\frac{V}{R}=\frac{0}{10}=0A$

(c) $V_A=10V,V_B=-2V$

$\Rightarrow V=V=V_A-V_B=10-(-2)=12V$

$I=\frac{V}{R}=\frac{12}{10}=1.2A$