The circuit in Figure P27.34a consists of three resistors and one battery with no internal resistance.
(a) Find the current in the resistor.
(b) Find the power delivered to the resistor.
(c) In each of the circuits in Figures Figure P27.34b, Figure P27.34c, and Figure P27.34d, an additional battery has been inserted into the circuit. Which diagram or diagrams represent a circuit that requires the use of Kirchhoff's rules to find the currents? Explain why.
(d) In which of these three new circuits is the smallest amount of power delivered to the resistor? (You need not calculate the power in each circuit if you explain your answer.)
