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Redstone power can be transmitted to devices which will then do something in response. Most types of blocks can become powered. If you push a button, two blocks become powered: the block containing the button, and the block the button is attached to. The button is the power source. A lever or pressure plate is a power source. A block of redstone is always powered, it is a constant power source. A button is a momentary power source. In general, opaque blocks can be powered by redstone while any transparent blocks and non-solid blocks can't. Consider three basic Minecraft power sources:# lever# button# redstone torchOther power sources include pressure plates and daylight sensors. With a daylight sensor, you can create a circuit that opens your door during the day, and it closes at night. This automatic daylight door would keep mobs out at night.Transmit power with redstone wire. Place redstone dust on the floor to make a "wire trace" on the surface of the ground, much like a printed circuit board. Redstone wire becomes powered when it is adjacent to a powered block. Redstone power runs along the redstone wire, powering the blocks underneath the wire, or near it at certain aspects. Power will travel 15 blocks from a redstone torch through redstone wire to a block. A repeater block will be required to transmit power further away. This is similar to DC power. A repeater block can also add a preset delay of up to 4ms. To learn how to use redstone power there is a [https://www.youtube.com/watch?v=apVheJezNzE good beginner redstone circuit video tutorial] by those fine folks at Minecraftopia Videos.