A series circuit consists of a voltage source and four resistors (R1=1k-ohm; R2=30-ohm; R3=470-ohm; R4=2k-ohm). The resistor of 1k-ohm has a voltage of V1=3V across its terminals.
a) Find the current out of the voltage source.
b) Find the voltages across R2, R3, and R4.
c) Find the voltage across the source.