1. **金属导体**(如铜、铝):温度升高时,原子热振动加剧,导致自由电子移动受阻,电阻**增大**(选项a)。 2. **半导体**(如硅、锗):温度升高时,载流子(电子和空穴)浓度增加,导电能力增强,电阻**减小**(选项b)。 3. **特殊材料**:某些合成材料(如康铜、锰铜)的电阻几乎不随温度变化(选项c),用于精密...
In a series circuit, if the resistance of one component increases, what happens to the total current in the circuit? A. Increases B. Decreases C. Remains the same D. Becomes zero 相关知识点: 试题来源: 解析 B。在串联电路中,总电阻等于各电阻之和。当一个电阻增大时,总电阻增大,根据欧姆定律...
In the circuit shown in figure, the equivalent resistance between A and B is ___Ω. View Solution
If you triple the voltage in a circuit, what happens to the amount of current? When the resistance in a circuit remains constant, how are the voltage and current related? Does electric potential increase in a closed circuit? Does adding more resistors decrease t...
Resistance in power lines causes losses when current is transmitted, but that loss can be reduced by increasing the voltage. However, it’s difficult to create high-voltage DC current, so electricity is transmitted as AC current and then stepped down to a lower voltage by transformers before ...
What is the total resistance for the circuit given below with the values R1=19Ω,R2=14Ω,R3=27Ω,R4=12Ω,R5=30Ω,R6=17Ω. circuit Resistors in Series and in Parallel; Equivalent Resistance: Resistors in series The equivale...
Continuity test can be used to measure Resistance in anelectric circuit. How to do a Continuity Test with Digital Multimeter Insert theBlack Test ProbeLead into theCOM jack. Next, Insert theRed Test ProbeLead into theVΩ jack Turn the Pointer of the Multimeter to Continuity Test mode (See...
In physics, voltage can be calculated using Ohm’s Law, which tells us that voltage equals resistance times current. Resistance indicates the difficulty with which electricity flows. Imagine a water main. As the pipe grows smaller, resistance increases, and it becomes more difficult for the water...
A Multilayer PCB is made with three or more conductive copper layers. The conductive foil appears to be various layers of a multi-sided circuit board. The different inner layers are processed in pairs (on a core) and then bonded together using prepreg as the insulating layer. The layers are...
Calculate the value of the resistance R in the circuit shown in the figure so that the current in the circuit is 0.2 A. What would be the potential difference between points B and E? View Solution Calculate the value of the resistance R in the circuit shown in Fig. so that the curren...