Between terminals P and Q three parallel branches are connected as follows:
• Branch A: a 3 Ω resistor in series with an 18 V source whose positive terminal is at P.
• Branch B: a 2 Ω resistor in series with a 12 V source whose positive terminal is at Q.
• Branch C: a single 6 Ω resistor.
(a) Determine the current in each branch, taking the direction from P to Q as positive.
(b) Hence calculate the power supplied or absorbed by each source and state whether each source delivers power to, or receives power from, the circuit.