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A conductor obeys Ohm's Law if the ratio of voltage to current remains constant over a wide range of voltage variations -and, then, only over that particular range of voltages. Put another way, a graph plotted of current against voltage must be a straight line. If the ratio of voltage to current varies, or if the resulting graph is anything other than a straight line, then the conductor does not obey Ohm's Law.
Ohm's Law is by no means an universal law, and only a limited number of materials obey Ohm's Law. Those that do are called 'ohmic' or 'linear' materials; those that don't are called 'non-ohmic' or 'non-linear'.
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Megger value for single conductor?
It depends on the value of voltage being applied to the wire in normal use. Voltages up to 750 volts can be used on wires reading as low as .5 meg ohms. Engineers like to see 5 meg ohms on conductor readings.
What are ohms used for?
Ohms are used to measure electric resistance.
How do you know if you have a bad cable when checking ohms?
If the ohms are infinite or greater than one megohm you can conclude the cable is bad. Usually if the ohms are greater than 3 ohms the cable is bad. If the cable is less than 3 ohms it depends on what the cable is used for and how long it is.
Is copper conductor or insulators?
Conductor, which is why it's used for wires.
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.
What happens to resistance when increasing cable length?
this is because there will be more collisions between atoms and electrons as there is a greater distance to travel. The longer the length of wire, the more collisions. It is like a traffic jam, the longer the road, the loner you are stuck in it for.
What is the difference between conductor resistance and insulation resistance?
The resistance of a conductor is relatively low while an insulator should have very high resistance. The former is used to transmit electricity and the latter is designed to inhibit flow of electricity.
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 are sources of errors in experiment to verify ohm's law?
Sources of errors in experiments to verify Ohms law can be as simple as temperature or pressure. These errors can also be caused by length and diameter of the conductor being used in the experiment.
What is a word starting with O that has to do with conductor?
Sounds like an "orchestra" - which is led by a conductor. Other possibilities would be: Oboe - and instrument in the orchestra led by the conductor Overture - an orchestral composition forming the prelude or introduction to an opera, oratorio, etc. - which is led by a conductor Opera - the music for which is led by a conductor Oratorio - the music of which is led by a conductor Octave - An interval covering eight diatonic scale degrees - which is used in the music the conductor conducts Octet - a group of eight instruments or singers - which may be led by a conductor Orchestration - the art of arranging, writing or scoring music for an orchestra - which many conductors are also adept at but even if they are not, the music they lead is probably going to be the product of orchestration Opus - "Work". With a number, used to show the order in which the works by a given composer were written or published. Opus numbers are most often used for composers who catalogued their own works - which a conductor leads a group of musicians to perform Of course you could also think of an electrical conductor - in which case the best word would probably be "ohm" or "ohms". An ohm is a measure of electrical resistance - the reciprocal of conductivity of a conductor. Also: ohmmeter - which is used for measuring resistance (the reciprocal of conductivity) ohmage - Electrical resistance expressed in ohms overload - what happens to a circuit if it's not a good enough conductor
Why is a resistor called so?
I resistor is called so because it provides electrical resistance (measured in ohms). Electrical resistance describes how an electrical conductor (a wire) opposes the flow of an electrical current (flow of electrons). To overcome this opposition a voltage (a energy) must dropped (used) across the conductor (wire).
What is meggers?
A megger is an electrical instrument that is used to measure the resistance of insulation by applying a DC voltage to the conductor. One lead is connected to the conductor and the other lead is connected to ground. Safe insulation reading to ground should be above 2,000,000 ohms or 2 megs.
