In general, Mine Blocks redstone circuits are assumed to behave like 2 dimensional Minecraft circuits, and Minecraft guides are applicable where this wiki is deficient.
This page is provided for Mine Blocks-specific details, special cases, and links to related topics.
Basic Power configurations
Symbols for significant power levels with distinct effects.
The green blocks act as relays when present, causing the target tile states to be updated according to the dust state, otherwise they stay at their last state. The left version overrides the right.
The circled tile remains charged after power is removed, and activates the tile above it, unless explicitly depowered by other means.
The above scheme is simplified for practical use, but there are configurations that it can't describe.
The block updating order and internal states are not described here, but can have unexpected and temporary side-effects. It is easy to create "phantom" power in ways other than shown above. An off-switch attached to such positions then removed is a reliable remedy unless there is an active source causing it. It is also common for tiles that should be powered to remain inactive, or be made inactive by touching unpowered dust for example. The remedy is to force the update to work differently either by resetting power or partial rebuilding.