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Food in a refrigerator with its door open. A refrigerator, commonly shortened to fridge, is a commercial and home appliance consisting of a thermally insulated compartment and a heat pump (mechanical, electronic or chemical) that transfers heat from its inside to its external environment so that its inside is cooled to a temperature below the room temperature. [1]
A refrigerator truck or chiller lorry (also called a reefer), is a van or truck designed to carry perishable freight at low temperatures. Most long-distance refrigerated transport by truck is done in articulated trucks pulling refrigerated hardside (box) semi-trailers , although insulated curtainsiders are common in some countries.
7-pin ISO 1724 trailer connector type 12N (Towing vehicle side). This connector uses a mix of pin and socket terminals. Physical design according to standard ISO 1724. [4] [8] The 7-pin connector uses all 7 pins on newer trailers according to the ISO standard. [9] [10] On older trailers there's sometimes a 5-wire setup using a 7-pin connector.
Near the end of the nineteenth century, the invention of dry cell batteries, which replaced the liquid electrolyte with a paste, made portable electrical devices practical. [ 12 ] Batteries in vacuum tube devices historically used a wet cell for the "A" battery (to provide power to the filament) and a dry cell for the "B" battery (to provide ...