Gauges, of wires

I could lend you my jig, she says. It ll take just about any gauge of wire. ... 

Wire selected (gauge of wire) = 6 Resistance of the wire... 

The toroid should have an overall wire gauge of 12AWG. I will use 100 strand Litz wire to minimize the skin effeets. 

The power winding of the inductor (transformer) not only must support the maximum average input current but the output current as well. So, the wire gauge of the winding should be... 

The specification of wires can be confusing. All wires diameters are based upon the American Wire Gauge (AWG) table, published in the early 20th century. The metric countries directly converted these dimension (inches) to millimeters and created what is now the lEC R20 wire table. This is shown below in both measurement systems in Table F-t. 

Wire - The diameter of wire used in weaving cloth measured by gauge or decimal inch. 

In one plant, light oil was pumped at intervals from a tank at atmospheric pressure to one at a gauge pressure of 15 psi (1 bar). For many years the practice was not to close any isolation valves but to rely on the check valve in the pump delivery. One day a piece of wire got stuck in the check valve, oil flowed backward, and the atmospheric tank overflowed (Figure 18-4). 

Wire is often sold in pound spools according to the wire gauge number. That number refers to the diameter of the wire. How many meters are in a 10-lb spool of 12-gauge aluminum wire A 12-gauge wire has a diameter of0.0808 in. Aluminum has a density of 2.70 g/cm3. (V = irr2 )... 

Braiding hoses with wires to resist high burst pressures or for external protection is common, using a braiding machine. The wires used, usually of steel, will be either zinc- or brass-coated to achieve adhesion during vulcanisation. The gauge of the wire and its tensile properties will be matched to the expected service demands for the hose. 

The thickness of wire often is measured using a system called the American Wire Gauge (AWG) standard. The smaller the gauge number, the larger the diameter of the wire. For example, 18-gauge copper wire has a diameter of about 0.102 cm 12-gauge copper wire has a diameter of about 0.205 cm. Such small diameters are difficult to measure accurately with a metric ruler. In this experiment, you will plot measurements of mass and volume to find the density of copper. Then, you will use the density of copper to confirm the gauge of copper wire. 

Obtain a piece of 12-gauge copper wire and a piece of 18-gauge copper wire. Use a metric ruler to measure the length and diameter of each wire. 

TABLE A6. Standard Gauges of Sheets, Plates, and Wires... 

Note particularly that film electrodes make it economically practical to use very expensive materials as electrodes because of the very small quantities required to form the film. For example, a platinum film of 300 nm thickness and 1 cm2 cross-sectional area contains 640 pg of platinum. A macroscopic wire electrode of the same surface area constructed with 26-gauge platinum wire (0.4 mm diameter, 7.9 cm long) contains 210 mg of platinum, or 330 times as much platinum. At a price of 60/g, the cost of the platinum in the film ( 0.04) is much lower than the cost of the wire ( 12.80). Despite the great reduction in raw materials cost, the resulting electrode may not actually be proportionally less expensive than bulk platinum for small numbers of film electrodes, due to significantly greater fabrication costs. However, when produced on a large scale, costs of film electrodes may be dramatically lower. 

Fig. 9.6. Details of the solenoid stirrer. If the solenoid is wound with 2 lb of 22-gauge magnet wire, it will withstand 115 V in intermittent bursts. The current interrupter, shown above, involves a cam which opens and closes a microswitch.

Fig. 7.10. Cutaway of a cold cathode (Penning) gauge. The wire anode (A) is connected through a ceramic insulator (i) to the high-voltage lead (H). Under the influence of the magnetic field created by M, the elcclrons travel a long spiral path between the body and the anode. The current, which arises from electrons and positive ions of the ionized gas molecules, is related to the pressure. The open end (C) is attached to the vacuum system.

The conditions for obtaining the correct heating should be checked by means of a fine wire thermocouple inserted through a pierced lid having its unprotected junction in contact with the center of the base of the empty crucible. The end of the couple should be formed into a flattened loop so that the junction and a portion of each wire rests on the bottom of the crucible during a temperature measurement. The couple should be made of wires not heavier than 34-gauge platinum or 26-gauge base metal. 

---