GFA Lighting and Electric Practice Test

In a distribution setup where loads are connected in parallel, the voltage across each branch stays the same as the source. So if you read 120 V at the first split and also 120 V at the end of the line, the line voltage is 120 V, regardless of how much current is being drawn.

The fact that the total load is 600 A tells you the amount of current the source must supply, not the voltage. The current adds up across parallel branches, while the voltage remains the same across all branches (assuming the wiring has low impedance and the supply can hold the voltage). If you wanted to know the total power drawn, you’d multiply 120 V by 600 A to get 72 kW, but the voltage itself remains 120 V.