You apply a potential difference of 4.50 V between the ends of a wire that is 2.50 m in length and 0.654 mm in radius. The resulting current through the wire is 17.6 A.
A.What is the resistivity of the wire?
1) Why is the resistivity of the filter cake (the solid) higher
than resistivity of filtrate, for after doing the filtration
drilling fluids?
2) Should drilling fluids be high in resistivity or low? and
why?
Answer the following short questions.
a. A rectangular block has a resistivity of ? and resistance of
?. If we scale it up in size by a factor of 2 in every direction,
what is the new resistivity and resistance as a function of ? and
??
b. Small aircraft often use 24-V electrical systems rather than
the 12-V systems used in automobiles, even though the electrical
power requirements are roughly the same. This is because a 24-V
system uses...
At a certain temperature T1, a (1.8922x10^2) mm rod
of a copper-nickel alloy has a resistivity of (2.770x10^1) x
10-8 Ω-m. For pure copper, the resistivity at 0°C is
1.58 x 10-8 Ω-m and the change in resistivity per degree
increase in temperature is 6.50 x 10-11 (Ω-m)/°C. The
value of A for nickel in copper is 1.18 x 10-6 Ω-m and
the coefficient of thermal expansion of this alloy is (1.543x10^1)
x 10-6(°C)-1.
If the resistivity of this alloy...
Copper wire has a resistivity ρ = 1.7 × 10-8
Ω⋅m when at 20°C and it has a temperature coefficient α =
3.9 × 10-3 K-1. A solid cylinder of copper of
length L = 45 cm and diameter D =
1.5 mm has one end held at T1 =
6°C and the other end is held at T2 =
270°C. The temperature increases linearly between the two
ends of the cylinder. Determine the total resistance in
milliohms.
1.
A tube with a 1.00mm diameter filled with a saline solution of
resistivity 9.75×10-7?·m has an electric field of
22.5V/m when a potential difference is applied on either end of the
tube.
what is the current flowing through the saline solution
2.
A tungsten wire of length (1/2)L and radius r is
attached to another tungsten wire of length (1/2)L and
radius 2r, forming one long wire of length L.
A potential difference is applied across the two ends...
i) What is the general expression for the electrical resistivity
of a metallic material with eutectic composition such as the Pb-Sn
solder material? Identify all the parameters in the expression.
ii) Based on your knowledge of single phased and multi-phased
materials, explain how you can make material choice for a device
based on resistive heating such as stove heating coils. Indicate
how the enhancements of the heating efficiency can be achieved in
single phased and multi-phased materials.
In the experiment: To determine the resistivity of the
given semiconductor sample by Four Probe method.
Why are there "four" probes instead of 2? what is the
mechanism of that four probe setup in relation with the
semiconductor that it touches?