Sometimes a rheostat is made from resistance wire wound on a heat-resisting cylinder, with the slider made from a number of metal fingers that grip lightly onto a small portion of the turns of resistance wire.
32.
Sometimes a rheostat is made from resistance wire wound on a heat-resisting cylinder, with the slider made from a number of metal fingers that grip lightly onto a small portion of the turns of resistance wire.
33.
A useful and practical lab standard resistance could be made with a certain length of resistance wire, such that it has a desired resistance with a stated precision at a stated temperature, and correction factors could be applied for other temperatures.
34.
Where the rheostat must be rated for higher power ( more than about 1 watt ), it may be built with a resistance wire wound around a semicircular insulator, with the wiper sliding from one turn of the wire to the next.
35.
If the potentiometer is attached to a constant voltage DC supply such as a lead acid battery, then a second variable resistor ( not shown ) can be used to calibrate the potentiometer by varying the current through the R 1 resistance wire.
36.
With food and ammunition for seven to 10 days, the Warsaw resistance wires Churchill, " The soldiers and the population of the capital look hopelessly to the skies, expecting help from the Allies . . . . Have you discussed in Moscow help for
37.
The active medium of the heater depicted at the right is a coil of nichrome resistance wire inside a fused silica tube, open to the atmosphere at the ends, although models exist where the fused silica is sealed at the ends and the resistance alloy is not nichrome.
38.
Because the resistance wire can be made very uniform in cross-section and resistivity, and the position of the wiper can be measured easily, this method can be used to measure unknown DC voltages greater than or less than a calibration voltage produced by a standard cell without drawing any current from the standard cell.
39.
No technology located in a circuit breaker or fuse panel could detect a high-resistance wiring fault as no measurable characteristic exists that differentiates a glow fault from normal branch circuit operation . "'Power Fault Circuit Interrupters "'( "'PFCI "') located in receptacles are designed to prevent fires caused by glowing connections in wiring or panels.
40.
My conjecture is that these two measurements will uniquely identify the odd resistor and its value ( ignoring the issues about measurement errors and resistor tolerances that Gr8xoz raises below I'm assuming that since we are allowed to use zero-resistance wires we also have a perfect ohmmeter and perfect one-ohm resistors ) . talk ) 00 : 22, 14 February 2011 ( UTC)
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