2. In the circuit below $R_1 = 2.0\Omega$, $R_2 = 4.0\Omega$, $R_3 = 5.0\Omega$, $R_4 = 10.0\Omega$, and $R_5 = 12.3\Omega$. (a) Calculate the equivalent resistance between the points a and b. (b) Given $\Delta V = 18.0 V$, calculate the current through the resistors $R_1$, $R_2$, $R_3$, and $R_4$. Draw the reduction circuits (2 points)