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Resistance of a wire is usually given as "so many" oms per foot (or meter, etc).
To actually determine a wire's resistance you would need a sensitive ohmmeter,
OR a known voltage source and an ammeter.
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∙ 11y ago
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How can pendulum be used to determine local gravitational acceleration?
Measure the length and the period
How does the length of a wire affect the resistance?
Yes, resistance is directly proportional to the length, and inversely proportional to the cross sectional area. R = p*l/A. Where R is the resistance of the piece of conducting material, p is Greek letter rho, representing the resistivity of the material, l (lower case L) is the length, and A is the area.
What is the electrical resistance measured in?
Resistance is the opposition to the flow of electrons (i.e. electrical current) in a conducting material such as a metal wire or a pair of contacts in a switch. Every substance has a certain amount of resistance. Resistance is measured in ohms. If one volt can push 1 amp of current through a substance, it has a resistance of 1 ohm. Some materials, like copper and aluminum have fairly low resistance, and are therefore used as electrical conductors (wires). Another answer Conductor resistance means a material's opposition to the flow of current that a conductor has. Ideally, in a wire, this should be nothing, i.e. 0 ohms, but in reality all conductors have a certain amount of resistance. For example, 1000 feet of 14 AWG (the common wire size used for 15 amp branch circuits in residential wiring in North America) has about 2.5 ohms of resistance. Further answers Think of a conductor as a resistor/resistance of a certain very low value in series with whatever load it is feeding. Current flowing through the conductor(s) will result in a voltage drop and power loss, manifested as heating of the conductors. The "line loss" formula is one variation of the power formula and is P = I2 x R, which can be used for calculating the power loss in the conductors. Remember that any power line to a 120 volt device has 2 lengths of conductor going to it (hot and neutral return). Therefore the total conductor length is the length of the power cord or electrical cable times 2. To calculate the voltage drop across the conductor resistance for a given current, you have to determine the conductor's resistance and use Ohm's law. Calculating the resistance of a length of conductor can be done using tables readily available in textbooks or via a websearch, assuming copper conductors at 20 degrees Celcius. You need to know the size of the conductor (AWG size, for American wire gauge) and the length of the conductor.
Why do copper or aluminum wires generally used for electrical transmission and distribution purposes?
Both metals have a low resistance to conductivity. They are extremely flexible and do not degrade under electrical transmission as do other metals. They are less expensive than the best conductors, silver and gold.
Is vernier caliper used to measure length or mass?
it is used to measure length .
Why are wires with high resistance used in light and toasters?
High resistance wires convert the energy used, into heat. That makes the toaster heat up or the light to turn on.
Why are wires with high resistance used in light bulbs and toasters?
High resistance wires convert the energy used, into heat. That makes the toaster heat up or the light to turn on.
Is resistivity the same for all materials with the same length?
Yes, because the resistivity does not depends on the length of any materials. Resistivity is constant.-Ariel DUmancas-No. The resistance in different materials is different. For example, Copper has a low resistance to electricity compared to plastic. This is also one reason why copper is used instead of plastic in wires. Knowing the resistance of different material helps decide what material should be use for different objects (like copper for wires in plastics)
How bright is the bulb when a shorter wire is used?
Depending on the length of the wire difference between the shot and long wire, in technical fact the bulb would be brighter if a shorter wire was used, but not that much brighter. Energy is used up as it travels along wires.
What is used to determine a mineral's resistance to being scratched?
The Mohs mineral hardness scale.
How do you find the perimeter of a triangle if you only know the angles and one of the lengths?
The law of tangents can be used to determine another side length; the sine rule can then be used to determine the third side length.
What is dynamic resistance and give you brief account about it?
A device's resistance to electricity, like in a wire's resistance to having electricity flowing through it, copper has very little, so that's why copper is used in wires.
A unit of measurement used to determine length?
meter, inch, yard
Does the resistance of a conductor incfrease by any measure when the conductor is in doubled in length?
The resistance is directly proportional to the length of conductor and inversely proportional to area of the cross section.If the length is doubled then the resistance will double.Resistance=rho*l/arho=resistivity of the material (Ohms/m) and depends on the material used for the wirel=length of the wirea= area of the cross section of the wire.
What scientist use to determine a minerals resistance to being scratched?
Moh's hardness scale was used to determine a mineral's resistance to being scratched. The tendency of a mineral to break along smooth flat surfaces is cleavage.
How can pendulum be used to determine local gravitational acceleration?
Measure the length and the period
Why are thick copper wires used as connecting wires?
-- Any energy dissipated by the conencting wires is lost from the circuit, and unavailable to do the job for which the circuit is intended. The less resistance the connecting wires have, the less energy they'll dissipate. So the connecting wires need to have as little resistance as possible. -- Copper is easy to work, easy to form wires from, and is the second-best electrical conductor known, after silver. Copper is used instead of silver because it costs less. -- The thicker any wire is, the less resistance it has.
