______ is constant in a parallel circuit.

• A. Voltage
• B. Voltage Drop
• C. Current
• D. Resistance

Answer: (B)

In a parallel circuit, the potential difference across each branch is the same as the source. Because every component is connected directly across the same two nodes, the voltage between those nodes remains fixed, so voltage is constant across the entire network. What changes is how much current flows through each branch, since each branch may have a different resistance. The total current is the sum of the branch currents. Therefore, the quantity that stays constant in a parallel circuit is the voltage.