Q3 (a) A cylindrical iron wire with a length of I, cross section area of A, and resistivity, p is shown in Figure 2. i. Express the diameter of the wire, d in terms of voltage per length, current and resistance using the Ohm's Law. ii. Determine the minimum diameter of the wire if a current of 6.5 Ampere flows through the wire at 20 °C. Given resistivity at 20°C, p20 °C is 9.81 x 106 2.cm. A = area -| = length- R p = resistivity R= PA Figure 2. A cylindrical iron wire for electrical conductor (b) Table 2 tabulates the electrical conductivity of several materials. Discuss ONE (1) most suitable material to be used as electrical insulator from the aspect of property-processing-performance relation. Table 2. List of electrical conductivity of several materials Electrical conducetivity, o (2.m)" 6.3 X 10' 5.8 X 10 4.2 X 10 Type of Materials Silver Сopper Gold Aluminum 3.4 X 10' Germanium 2.2 Silicon 4.3 X 104 Polyethylene Diamond 10-14 1014

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Q3
(a) A cylindrical iron wire with a length of l, cross section area of A, and resistivity, p
is shown in Figure 2.
i.
Express the diameter of the wire, d in terms of voltage per length, current
and resistance using the Ohm's Law.
ii.
Determine the minimum diameter of the wire if a current of 6.5 Ampere
flows through the wire at 20 °C. Given resistivity at 20°C, p20 °C is
9.81 × 106 Q.cm.
A = area
= length
R
p = resistivity
|=-W-
R = P
A
Figure 2. A cylindrical iron wire for electrical conductor
(b)
Table 2 tabulates the electrical conductivity of several materials.
Discuss ONE (1) most suitable material to be used as electrical insulator from the
aspect of property-processing-performance relation.
Table 2. List of electrical conductivity of several materials
-1
Type of Materials
Silver
Electrical conductivity, o (2.m)
6.3 X 10'
Сopper
5.8 X 10'
Gold
4.2 X 10'
Aluminum
3.4 X 10'
Germanium
2.2
4.3 X 104
Silicon
10-14
10-14
Polyethylene
Diamond
Transcribed Image Text:Q3 (a) A cylindrical iron wire with a length of l, cross section area of A, and resistivity, p is shown in Figure 2. i. Express the diameter of the wire, d in terms of voltage per length, current and resistance using the Ohm's Law. ii. Determine the minimum diameter of the wire if a current of 6.5 Ampere flows through the wire at 20 °C. Given resistivity at 20°C, p20 °C is 9.81 × 106 Q.cm. A = area = length R p = resistivity |=-W- R = P A Figure 2. A cylindrical iron wire for electrical conductor (b) Table 2 tabulates the electrical conductivity of several materials. Discuss ONE (1) most suitable material to be used as electrical insulator from the aspect of property-processing-performance relation. Table 2. List of electrical conductivity of several materials -1 Type of Materials Silver Electrical conductivity, o (2.m) 6.3 X 10' Сopper 5.8 X 10' Gold 4.2 X 10' Aluminum 3.4 X 10' Germanium 2.2 4.3 X 104 Silicon 10-14 10-14 Polyethylene Diamond
(c)
This question is based on the periodic table shown in Figure 3.
i.
Select TWO (2) types of intrinsic semiconductor from the given elements.
ii.
Develop ONE (1) p-type semiconductor by using the given elements.
iii.
Explain the charge carrier's mechanism of the p-type semiconductors
developed in c(ii) with the help of suitable sketches.
18
VIIIA
Не
13
14
15
16
17
Helium
4.0026
IIA
IVA
VA
VIA
VIIA
7
10
В
C
F
Ne
Boron
10.81
23
Carbon
12.on
24
Nitrogen
14.007
2-5
Oxygen
15.999
2-6
Fluorine
18.998
2-1
Neon
20.180
2-8
13
14
15
16
17
18
Al
Si
ci Ar
Aluminium
26.982
24-3
Silicon
28.085
2-84
Phosphorus
30.974
24-5
Sulfur
32.06
2-8-6
Chlarine
35.45
28-7
Argon
39.948
24-8
12
IB
30
31
32
33
34
35
36
Zn Ga
Ge
As
Se Br Kr
Zinc
65.38
Gallium
69.723
2-8-3
Germanium
72.430
244
Arsenic
74.922
24--5
Selenium
78.971
2-4-86
Bromine
79.904
24-8-7
Krypton
83.798
2-8-8-2
2-8-8-8
Figure 3. Periodic table of selected elements.
2.
Transcribed Image Text:(c) This question is based on the periodic table shown in Figure 3. i. Select TWO (2) types of intrinsic semiconductor from the given elements. ii. Develop ONE (1) p-type semiconductor by using the given elements. iii. Explain the charge carrier's mechanism of the p-type semiconductors developed in c(ii) with the help of suitable sketches. 18 VIIIA Не 13 14 15 16 17 Helium 4.0026 IIA IVA VA VIA VIIA 7 10 В C F Ne Boron 10.81 23 Carbon 12.on 24 Nitrogen 14.007 2-5 Oxygen 15.999 2-6 Fluorine 18.998 2-1 Neon 20.180 2-8 13 14 15 16 17 18 Al Si ci Ar Aluminium 26.982 24-3 Silicon 28.085 2-84 Phosphorus 30.974 24-5 Sulfur 32.06 2-8-6 Chlarine 35.45 28-7 Argon 39.948 24-8 12 IB 30 31 32 33 34 35 36 Zn Ga Ge As Se Br Kr Zinc 65.38 Gallium 69.723 2-8-3 Germanium 72.430 244 Arsenic 74.922 24--5 Selenium 78.971 2-4-86 Bromine 79.904 24-8-7 Krypton 83.798 2-8-8-2 2-8-8-8 Figure 3. Periodic table of selected elements. 2.
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