A circuit is made using $R_1, R_2, R_3, R_4$ and a battery as shown in the following figure. Find the equivalent resistance of the given circuit and the current passing through $R_3$
The circuit can be redrawn as shown in the figure below,
So, the equivalent resistance of the three parallel branches is given as, $R_{e q}=\frac{1}{\frac{1}{0.5+0.5}+\frac{1}{1}+\frac{1}{1}}=\frac{1}{3} \Omega$ Now, from Ohm's law $I=\frac{V}{R}=\frac{27}{1 / 3}=27 \times 3=18\, A$ Here in the figure, 3 branches are of equal resistance, so current will divide equally in each branch, So, current in $R_{3}$, $I_{R_{3}}=\frac{27 \times 3}{3}=\frac{81}{3}=27\, A$
The current electricity whose direction remains the same is known as direct current. Direct current is defined by the constant flow of electrons from a region of high electron density to a region of low electron density. DC is used in many household appliances and applications that involve a battery.
Alternating Current
The current electricity that is bidirectional and keeps changing the direction of the charge flow is known as alternating current. The bi-directionality is caused by a sinusoidally varying current and voltage that reverses directions, creating a periodic back-and-forth motion for the current. The electrical outlets at our homes and industries are supplied with alternating current.
