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| Parallel connection
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A way of joining photovoltaic cells or modules by connecting positive leads together and negative leads together; such a configuration increases the current, but not the voltage. |
| Parallel lines
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Lines that are the same distance apart along a straight length. |
| Parallel system
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Two or more identical size heaters piped with water connections, that is, cold water travels equal distance into the inlets of the heaters from a "T" connection and hot water travels equal distance from the outlet of the heaters to a "T" connection. |
| Parallel walls
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Stud walls, which are built close but not touching to give some insulation from sound. When walls don't touch the vibration of one does not result in the vibration of the other. |
| Parallels
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Gauges of hardened, precision lapped steel, either adjustable or not, which is used to layout or measure parallel lines. |
| Parapet
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Protective, low wall along a roof or any edge or below a terrace. |
| Parasite
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Any plant that grows upon another. It steals its moisture and nourishment from its host. Mistletoe is a good example. |
| Parasitic plant
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A plant which lives on, and acquires it's nutrients from another plant. This often results in declined vigor or death of the host plant. |
| Parcel
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A piece of land that is usually a part of a larger acreage. |
| Parge coat
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Thin coat of cement mortar applied to a masonry wall for refinement or dampproofing. |
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