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Well, there's typically two types of materials-Those with positive temperature coefficient and those with negative temperature coefficient.
Positive temperature coefficient are those whose resistance increases as temperature increases.
Negative temperature cofficient are those whose resistance decrease when the temperature increase.
There are however some alloys such as Manganin& Constantan whose resistance is not affected by temperature
What else can I help you with?
What is the significance of the constant temperature reference in ohms law?
As temperature affects resistivity, the resistance of a conductor may change if its temperature is allowed to increase. For pure metal conductors, the resistance generally increases as the temperature increases.Ohm's Law ('the current flowing along a conductor, at constant temperature, is directly proportional to the potential difference across that conductor') only applies when the resistance of the conductor is constant so, when verifying Ohm's Law, the temperature must be kept constant, in order to keep the resistance constant.It should be pointed out that the ratio of voltage (U) to current (R) is called resistance (R), and the resistance of a circuit can be found from the equation, R = U/I whether Ohm's Law applies or not -but Ohm's Law itself only applies when the ratio is constant over a range of voltage variation.
How does the resistance of a transformer vary?
The resistance of a transformer primarily refers to the resistance of its windings, which is typically fixed and does not change significantly under normal operating conditions. However, the effective impedance seen by the primary or secondary side can vary based on load conditions and frequency. Additionally, factors such as temperature changes can affect the resistance of the windings, as resistance generally increases with temperature. Overall, while the intrinsic resistance remains constant, the apparent resistance can vary due to external factors.
What is resistance of 400KV cable?
The resistance of a 400 kV cable depends on several factors, including its length, cross-sectional area, material (typically copper or aluminum), and temperature. Generally, high-voltage cables like those rated for 400 kV are designed to have low resistance to minimize power losses. For precise resistance values, one would typically refer to the manufacturer's specifications or standards, as the resistance can vary significantly based on design and construction.
What is the effect of temperature on impact resistance?
Temperature significantly affects the impact resistance of materials. Generally, as temperature decreases, many materials, particularly metals and polymers, become more brittle and less able to absorb energy during an impact, leading to increased susceptibility to fractures. Conversely, at higher temperatures, materials may exhibit improved ductility and toughness, allowing them to better withstand impacts. The specific response, however, can vary widely depending on the material type and its properties.
What is the resistance of SCR anode and Cathode?
The resistance of a Silicon Controlled Rectifier (SCR) anode and cathode is typically very low when the SCR is in the forward conducting state, allowing current to flow easily. In the reverse state, the resistance is very high, effectively blocking current flow. The exact resistance values can vary based on the specific SCR model and operating conditions, but the general principle remains the same: low resistance in the forward direction and high resistance in the reverse direction.
Why is a filiament lamp a non ohmic conductor?
A filament lamp is a non-ohmic conductor because its resistance changes with applied voltage. As the voltage increases, the resistance also increases. This is due to the temperature-dependent behavior of the filament material, which causes the resistance to vary.
How does resistance of metal vary with temperature?
The resistance of metals generally increases with temperature due to increased atomic vibrations that impede the flow of electrons. This relationship is described by the temperature coefficient of resistance, which varies for different metals.
Graph of resistance of filament lamp against potential difference?
As potential difference increases in a filament lamp, resistance also increases due to an increase in temperature. The relationship between resistance and potential difference in a filament lamp is non-linear due to the temperature-dependent nature of resistance in the filament material. At low voltages, the resistance is relatively low, but as the temperature of the filament increases with higher voltages, the resistance also increases.
What is relation between voltage and temp?
The relationship between voltage and temperature can vary based on the material or device in question. In general, an increase in temperature can lead to an increase in resistance, which in turn can affect the voltage drop across a circuit. It is important to consider the specific characteristics of the material or device when analyzing the relationship between voltage and temperature.
What is the significance of the constant temperature reference in ohms law?
As temperature affects resistivity, the resistance of a conductor may change if its temperature is allowed to increase. For pure metal conductors, the resistance generally increases as the temperature increases.Ohm's Law ('the current flowing along a conductor, at constant temperature, is directly proportional to the potential difference across that conductor') only applies when the resistance of the conductor is constant so, when verifying Ohm's Law, the temperature must be kept constant, in order to keep the resistance constant.It should be pointed out that the ratio of voltage (U) to current (R) is called resistance (R), and the resistance of a circuit can be found from the equation, R = U/I whether Ohm's Law applies or not -but Ohm's Law itself only applies when the ratio is constant over a range of voltage variation.
How does the resistance of a transformer vary?
The resistance of a transformer primarily refers to the resistance of its windings, which is typically fixed and does not change significantly under normal operating conditions. However, the effective impedance seen by the primary or secondary side can vary based on load conditions and frequency. Additionally, factors such as temperature changes can affect the resistance of the windings, as resistance generally increases with temperature. Overall, while the intrinsic resistance remains constant, the apparent resistance can vary due to external factors.
What a relation between temperature and resistance?
Electricity is energy. Only matter can have temperature.
What combination of factors is most suitable for increasing the electrical conductivity of metals?
Resistivity is a constant for any particular material, and independent of that material's physical dimensions or shape. However, it does vary with temperature which is why resistivity is always quoted at a particular temperature. Variations in resistivity due to temperature change is the reason that the resistance of a material varies with temperature. In SI, resistivity is expressed in ohm metres.
What is temperature coefficient for insulator?
"Temperature coefficient" means, how does a certain physical quantity vary, depending on the temperature. In this case, the physical quantity in question is probably the electrical resistance, or the electrical resistivity.
How does resistance vary with the length of a conductor?
Resistance in a conductor increases as the length of the conductor increases. This is because a longer conductor provides more material for electrons to collide with, resulting in more resistance to the flow of electric current.
What temperature does a metalloid acts as a conductor?
Metalloids typically exhibit semiconductor properties, conducting electricity under certain conditions, often influenced by temperature. For example, silicon, a common metalloid, becomes a better conductor as temperature increases due to increased thermal energy that allows more electrons to flow. Generally, metalloids can start to conduct electricity at temperatures above room temperature, but the specific temperature can vary depending on the material and its purity.
What is resistance of 400KV cable?
The resistance of a 400 kV cable depends on several factors, including its length, cross-sectional area, material (typically copper or aluminum), and temperature. Generally, high-voltage cables like those rated for 400 kV are designed to have low resistance to minimize power losses. For precise resistance values, one would typically refer to the manufacturer's specifications or standards, as the resistance can vary significantly based on design and construction.
