Identify the circuit components and their values.

Step 1: Identify the circuit components and their values.
The circuit consists of three parallel branches. Each branch contains a voltage source and a resistor in series.

• Branch 1 (Top): Resistor $R_1 = 3 \, \Omega$, Voltage source $E_1 = 6 \, V$. The positive terminal of $E_1$ is on the left.
• Branch 2 (Middle): Resistor $R_3 = 3 \, \Omega$, Voltage source $E_2 = 9 \, V$ (assuming the red mark indicates the value). The positive terminal of $E_2$ is on the left.
• Branch 3 (Bottom): Resistor $R_2 = 3 \, \Omega$, Voltage source $E