For the circuit shown in the figure, $R_{1}=6.00 \Omega, R_{2}=6.00 \Omega$, $R_{1}=2.00 \Omega, R_{t}=4.00 \Omega, R_{5}=3.00 \Omega,$ and the potential difference is $12.0 \mathrm{~V}$ .
a) What is the equivalent resistance for the circuit?
b) What is the current through $R_{5} ?$
c) What is the potential drop across $R_{3} ?$