The difference between power and signal flow on a system block diagram is that signal flows from left to right and power flows from right to left.

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In a system block diagram, the convention for signal flow is typically from left to right, but there is no strict rule that power flows from right to left. Power flow is not universally defined by its direction on such diagrams and can vary depending on the specific system design and the conventions used by the diagram's creator.

The Difference Between Power and Signal Flow on a System