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Chapter 9: Current Electricity

60 Questions 60 Minutes Pass: 60%
1 The current which is assumed to be flowing in a circuit from positive to negative terminal is called:
2 When no current flows through a conductor, the free electrons:
3 When current flows through a conductor, the net charge is:
4 In a non-uniform wire, which quantity is cross-section independent?
5 Drift velocity is caused by:
6 At absolute temperature T, electron average speed without field is:
7 When wire temperature increases under constant PD, drift velocity:
8 Resistors with one end joined are in:
9 If wire length and radius are both tripled, resistance becomes:
10 With temperature increase, conductivity:
11 Metal resistance increases with temperature because:
12 Resistance varies with temperature:
13 Ohm's law applies to:
14 Ohm's law requires:
15 Possible resistor combinations (each R):
16 Wire resistance calculation (ρ=3.14×10⁻⁶ Ω-m, r=0.1mm, L=10m):
17 Temperature coefficient (R₀=10Ω, R₁₀₀=20Ω):
18 Resistance when length doubles (constant volume):
19 Specific resistance unit:
20 If length and area both double, resistance:
21 Resistivity depends on:
22 Resistance depends on:
23 Electrons flowing in 1A current:
24 Ampere-second unit measures:
25 10 A equals:
26 Parallel equal resistors have:
27 Two resistors give R_series=7.5Ω, R_parallel=1.66Ω:
28 Three resistors (2Ω,3Ω,6Ω) to get 4Ω:
29 Bulb resistance at 110V, 0.5A:
30 Voltage needed for 120mA→160mA at 24V:
31 Ohmic conductors have:
32 Voltage drop when current decreases from 40mA to 10mA at 16V:
33 Reversed ohmic conductor V-I graph:
34 Series circuit total resistance is:
35 Parallel circuit total resistance is:
36 Ohm's law applies to:
37 Resistance when length doubles (constant area):
38 In series circuits:
39 Electrons constituting 1A current:
40 Specific resistance most affected by:
41 3Ω wire cut into triangle: equivalent resistance:
42 100W bulb working 6hr/day energy/month:
43 Heat ratio H₁/H₂ for 100W/250V vs 200W/250V lamps:
44 Kirchhoff's laws conserve:
45 Length & radius doubled → resistance:
46 Three 60W/200V bulbs in series at 200V: power:
47 Max power from 10V battery with 10Ω load:
48 Current with 20V across 2 siemens:
49 Ohm's law requires:
50 Negative temperature coefficient:
51 Power when voltage increases from 100V to 150V (500W originally):
52 US 60W bulb resistance vs Pakistan (220V→110V):
53 Balanced Wheatstone bridge: find X (100Ω,200Ω,100Ω):
54 Potentiometer accuracy advantage:
55 Net charge on conductor with 1A current:
56 Current direction convention:
57 No current → free electrons:
58 Non-uniform wire: cross-section independent quantity:
59 Drift velocity caused by:
60 Copper line resistance change (+35°C to -30°C, α=0.00427/°C, R₀=100Ω):