Edison 3-wire system practice

DC supply: neutral current and voltage calculations

Loaded Edison system

A 3-wire DC supply feeds the loads below through three conductors with resistance. The loads draw the currents shown. Find the voltage across each group of loads and the current in the neutral. Use electron flow: electrons leave the negative terminal, pass through the loads and return to the positive terminal.

Your answers

Voltage across the L1–N load(s): V

Voltage across the N–L2 load(s): V

Voltage across the L1–L2 load: V

Neutral current (value): A Direction:

Open neutral

The DC loads below draw the stated currents with the neutral intact, at the voltage each load actually sees after the line and neutral voltage drops (treat each as a fixed resistance). The neutral conductor now opens between the supply and the loads. Find the voltage across each load.

Your answers

Voltage across lower-voltage load A (L1 side): V

Voltage across lower-voltage load B (L2 side): V

Voltage across the L1–L2 load: V