Voltage Across Common Point When 5V, 10V, 15V Sources Connected in Parallel

Connecting multiple voltage sources of different voltages (5V, 10V, 15V) in parallel is generally unsafe and not recommended. The resulting voltage at the common point depends on the internal impedances, current limits, and protection features of each source. Lower voltage sources may be damaged due to reverse voltage stress, capacitor failure, or overcurrent conditions. Power supplies typically regulate their output voltage and current, but when paralleled with higher voltage sources, the lower voltage supplies can be forced into shutdown, fuse blowing, or catastrophic failure including smoke or fire. Most DC power supplies do not have output diodes to prevent backflow; diodes are usually on the AC input side for rectification. The voltage at the common node will likely be dominated by the highest voltage source if it can supply sufficient current, but this can cause damage to other sources. Safety precautions such as using current limiting, isolation diodes, or dedicated load sharing circuits are necessary. Experimental attempts without proper safeguards can result in hazardous conditions including fire and equipment destruction.
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