Problem 1: Four resistors are connected to a battery as shown in the figure below, with ε = 15.0 V, R1 = 10.0 Ω, R2 = 20.0 Ω, R3 = 40.0 Ω, and R4 = 30.0 Ω.
a. What is the equivalent resistance of the circuit?
b. What is the potential (in volts) across each of the four resistors?
c. What is the current across each of the four resistors?