Final answer:
In a circuit powered solely by batteries, the selected battery, PB, will provide the power. To determine which busses are powered, consider the currents flowing through each branch and use the equation P = IV. The branches or busses that are powered will receive a portion of the total current from the battery.
Step-by-step explanation:
In a circuit powered solely by batteries, the selected battery, PB, will provide the power. The busses that are powered refer to the branches or components of the circuit that receive current from the battery. To determine which busses are powered, we need to consider the currents flowing through each branch.
Using the equation P = IV, where P represents power, I is the total current flowing through the battery, and V is the voltage across the battery, we can calculate the currents for each branch. By adding up these currents, we can find the total current flowing through the battery.
Keep in mind that the voltage across the battery must be equal to the total voltage across all other circuit components. Therefore, the branches or busses that are powered will receive a portion of the total current from the battery.