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What is the significance of the constant temperature reference in ohms law?
Wiki User
∙ 12y ago
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.
Wiki User
∙ 12y ago
Wiki User
∙ 11y agoBecause the resistance of conducting materials vary (in different degree and sense) with temperature.
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What is the main objection of ohm's law in measuring resistance?
Temperature. Ohms law is applicable to measure resistance of an element at constant temperature only.
The voltage drop in each resistance is?
V=IR by ohms law. Voltage across the resistor is the product of current flowing and resistance of the conductor at constant temperature.
How many ohms does three kilo ohms multiplied by three micro ohms equal?
(3 x 103) x (3 x 10-6) = 0.009 squared ohms ... a quantity with no physical significance
3 ohms x 1k ohms x 25 ohms equals?
If the question means to indicate multiplication, then the product is 75,000 cubic ohms.This quantity has no physical meaning or significance.
What is the accptable value in ohms for a good earthing system?
10 ohms or less is considered a good earth ground reference. The lower, the better.
Why ohms law is valid only for constant temperature and constant pressure?
Because by varying temperature ,the conductivity hence the resistivity varies so the constant varies.
What is the main objection of ohm's law in measuring resistance?
Temperature. Ohms law is applicable to measure resistance of an element at constant temperature only.
Why is R Introduced in ohms law?
Ohms law in most simplest form states that for a given conductor at a constant temperature current and voltage are directly related. ie V proportional to I. To equate any terms we need a equality sign and in order to make it a equality relation we introduce a constant, resistance. It is an inherent property of the system that doesn't vary for given dimension and temperature.
The voltage drop in each resistance is?
V=IR by ohms law. Voltage across the resistor is the product of current flowing and resistance of the conductor at constant temperature.
What law has ohms in it?
Ohm's Law states that Voltage = Current x Resistance. Usually written as V = I x RAnswerNot Ohm's Law, which makes no reference to resistance.Ohm' Law states that 'the current flowing through a conductor is directly proportional to the applied voltage, providing the temperature of the conductor remains constant'.
What is ohms law constant of proportionality?
1 volt applied across one ohms Will conduct one Ampere
How many ohms does three kilo ohms multiplied by three micro ohms equal?
(3 x 103) x (3 x 10-6) = 0.009 squared ohms ... a quantity with no physical significance
3 ohms x 1k ohms x 25 ohms equals?
If the question means to indicate multiplication, then the product is 75,000 cubic ohms.This quantity has no physical meaning or significance.
What is the accptable value in ohms for a good earthing system?
10 ohms or less is considered a good earth ground reference. The lower, the better.
How do you converts ohms to dB?
You must find a resistance value for 0 dB as reference. If 1 Ohm = 0 dB then 10 ohms = 20 dB and 100 ohms = 40 dB.
What is the difference between the sensistor and thermistor?
Thermistor: Negative temperature coefficient Sensistor: Positive temperature coefficient.
How powerful are ohms?
Ohms do not relate to power per se. Ohms do however contribute how much power a circuit can deliver. In a given circuit the lower the resistance (measured in ohms) the higher the current & higher the power. This is assuming the voltage remains constant.
