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Q: For low resistance measurement by Kelvin double bridge 4terminals what would be the minimum distance between current and potential leads?
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How do you calculate work output for a simple machine?

The resistance force multiplied by the resistance distance.


What is the concept and principle of electronic distance measurement?

I have no clue what is this!Why do I have to type?


What do you mean by step and touch potential and it's standard value?

Step Potential is the potential Difference between two points on the earth's surface, separated by distance of one pace, that will be assumed to be one meter in the direction of maximum potential gradient (IS 3043) Touch Potential is the potential difference between a grounded metallic structure and a point on the earth's surface separated by a distance equal to the normal maximum horizontal reach, approximately one meter. (IS 3043)


What do use to measure Resistance?

To measure resistance, you could use an ohmmeter. But ohmmeters are not particularly accurate, so other methods are preferable. These include the use of Wheatstone's Bridge (which compares the unknown resistance with known values) or a Ducter (for very low resistances).


What is constant in ohms law?

Ohm's original law was 'The potential difference across a conductor is proportional to the current flowing through it, provided physical conditions such as temperature remain constant.'Today Ohm's law is expressed as E = IR or sometimes V = IR,the units being Volts, Amps and Ohms.AnswerOhm'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.