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Resistance is directly-proportional to a material's length and resistivity, and inversely-proportional to its cross-sectional area.
In SI, length is measured in metres, cross-sectional area is measured in square metres, and resistivity is measured in ohm metres.
In North-American units, for conductors of circular cross-section, length is measured in feet, cross-sectional area is measured in circular mils, and resistivity is measured in ohm circular mils per foot (although, for some strange reason, it is often written as 'ohms per circular mil foot', which doesn't make much sense if you apply unit analysis!).
Note that resistivity is affected by temperature, so figures for resistivity are always quoted at specific (usual ambient) temperatures. So temperature indirectly affects resistance.
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Why is electrical resistivity important to a design engineer?
electrical resistance increases current flow decreases.so to know the current flow in the network ,electrical resistance is required.AnswerResistivity is important, because it is one of the three factors that affect the resistance of a material. The other factors are the length and cross-sectional area of the material.
Electrical resistance is a property of conductors that is measured in units of?
Ohm
What causes resistance to increase or decrease?
Voltage, if voltage is increased resistance in the circuit increasesAnswerResistance is determined by the length, cross-sectional area, and resistivity of a conductor. Resistivity is, in turn, affected by temperature -so temperature indirectly affects resistance.These are the only factors that affect resistance. Voltage and current have no direct effect whatsoever on resistance. Current can affect resistance indirectly if it causes the conductor's temperature to increase.For AC circuits, 'skin effect', due to frequency, causes the current to flow towards the surface of a conductor which acts to reduce the effective cross-sectional area of that conductor. So, frequency can also indirectly affect resistance.
What is the units of temperature coefficient of resistance?
The unit of temperature coefficient of resistance is ohm per ohm per degree Celsius or say resistance per resistance per degree Celsius.
How might ambient temperature may affect the resistance values you would measure in a circuit?
Ambient temperature might affect the readings of the resistance value you would measure because the resistance of some materials changes with the temperature.
What three factors affect the resistance in a circuit?
The three main factors that affect resistance in a circuit are the material the wire is made of, the length of the wire, and the cross-sectional area of the wire. Other factors, such as temperature and temperature coefficient of resistance, can also impact resistance.
Which factor does not affect the resistance of a material?
The factor that does not affect the resistance of a material is the color of the material. Resistance is primarily determined by factors such as the material's dimensions, temperature, and composition.
What factors affect the resistance and voltage?
Factors that affect resistance include material type, length, cross-sectional area, and temperature. Factors that affect voltage include the number of cells in a circuit, the presence of a power source, and the type of material conducting the current.
Which of the factors below will not affect the placement of the PAPI units?
altitude
What are factors that affect viscosity and flow?
Pressure and temperature are the two factors that affect flow and viscosity. Viscosity refers to the resistance of a liquid to the shear forces.
What are the five factors that affect current flow?
The five factors that affect current flow are voltage (potential difference), resistance (opposition to flow), conductive material, temperature (affecting resistance), and circuit configuration (series or parallel).
How does the 4 factors affect the resistance?
The four factors that affect resistance are material, length, cross-sectional area, and temperature. Resistance increases with longer length and higher temperature, and decreases with greater cross-sectional area and more conductive material. These factors impact the ability of a material to impede the flow of electrical current.
What factors affect the amount of air resistance acting on an object?
shape, size, and speed
What are the factors that affect resistance?
The factors are: length, cross-sectional area and nature of substance.
Which one of the following does not affect the electrical resistance of a body?
The color of the body does not affect its electrical resistance. Electrical resistance is determined by factors such as the material, dimensions, and temperature of the body. The color of an object is related to its appearance and does not have a direct impact on its electrical properties.
What factors affect rock failure and resistance?
Factors that affect rock failure and resistance include rock type, composition, structure, and stress conditions. Rock strength is influenced by factors such as fracturing, weathering, and presence of discontinuities like faults and joints. External factors like temperature, pressure, and moisture content can also impact rock stability and resistance.
What are factors that affect resistance of electricity?
Factors that affect resistance of electricity include the type of material the wire is made of (e.g. copper vs. aluminum), the length of the wire (longer wires have higher resistance), and the cross-sectional area of the wire (thicker wires have lower resistance). Temperature also affects resistance, with higher temperatures typically leading to higher resistance.
