How to Understand Electricity: Volts, Amps and Watts Explained on Appliances > 자유게시판

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Some cartridge fuses are manufactured with end caps of different sizes to prevent accidental insertion of the wrong fuse rating in a holder, giving them a bottle shape. HRC fuses are widely used in industrial installations and are also used in the public power grid, e.g. in transformer stations, main distribution boards, or in building junction boxes and as meter fuses. Low-voltage high rupture capacity (HRC) fuses are used in the area of main distribution boards in low-voltage networks where there is a high prospective short circuit current. Some varieties of HRC fuse include special handling features. Coaxial cable is a round, jacketed cable that features an inner conductor (usually copper) surrounded by a black or white tubular insulating layer, surrounded by a tubular conducting shield made of braided wire. In the case of a solid conductor such as copper wire, the electrical resistance is proportional to the length of the conductor and inversely proportional to its cross-sectional area. Any electrical conductor can get excessively hot if too much current flows and in the case of wires, this can cause the plastic insulation covering the cable to melt or even catch fire. This stands for direct current so the current provided by the source only flows one way.

Once current is applied, resistance and voltage drop of a fuse will constantly grow with the rise of its operating temperature until the fuse finally reaches thermal equilibrium. There is a direct relationship between a fuse's cold resistance and its voltage drop value. Appliances that run on 220 volts must have a higher resistance so that they take less current to use the same amount of power as they would on 110volts. 220 volts connected to a 110 volts appliance would result in 4 times the power ending up in the appliance (because voltage is double and current is double), likely burning out the appliance. For safety reasons, all exposed metallic surfaces must be bonded to each other and to the MGN. The voltage rating of the fuse must be equal to or, greater than, what would become the open-circuit voltage. The voltage drop should be taken into account, particularly when using a fuse in low-voltage applications.

Corona and resistive losses can be estimated using a mathematical model. High rupturing capacity fuses can be rated to safely interrupt up to 300,000 amperes at 600 V AC. High rupture capacity fuses may be rated to interrupt current of 120 kA. For example, a glass tube fuse rated at 32 volts would not reliably interrupt current from a voltage source of 120 or 230 V. If a 32 V fuse attempts to interrupt the 120 or 230 V source, an arc may result. An appliance such as an electric heater rated at 2kW, doesn't always take 2kw of power. Does a 220V motor driven appliance that will operate down to 197V slow down and deliver less power or does it need more amps and use the same amount of watts? Electrical energy can also be converted to kinetic energy in an electric motor or to potential energy when an elevator is raised in a building. A spokesman told This is Money that if someone was to injure themselves tripping over a charging cable across a pavement, the owner could potentially be liable - though a personal injury lawyer and motor insurer claims this might not be the case (read more below).

The red plastic sleeve above the clamp identifies the name of the owner and provides a contact telephone number. When looking at the front of the socket with the earth aperture uppermost (as normally mounted) the lower left aperture is for the neutral contact, and the lower right is for the line contact. For example, fuse holders for North American class RK fuses have a pin that prevents installation of similar-appearing class H fuses, which have a much lower breaking capacity and a solid blade terminal that lacks the slot of the RK type. Automotive glass fuses were made in different lengths, to prevent high-rated fuses being installed in a circuit intended for a lower rating. Plasma inside the glass tube may continue to conduct current until the current diminishes to the point where the plasma becomes a non-conducting gas. A fuse rated for 1 A at 25 °C may conduct up to 10% or 20% more current at −40 °C and may open at 80% of its rated value at 100 °C.

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