at constant temperature,the current flowing through a conducter is directly proportional to the potential difference across its ends.
v=ir
v is the potential difference
i is the current flowing
r is the the resistance of the conductor
2006-07-06 23:21:53
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answer #1
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answered by jalaj 2
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Ohm's Law deals with the relationship between voltage and current in an ideal conductor. This relationship states that:
The potential difference (voltage) across an ideal conductor is proportional to the current through it.
The constant of proportionality is called the "resistance", R.
Ohm's Law is given by:
V = I R
where V is the potential difference between two points which include a resistance R. I is the current flowing through the resistance. For biological work, it is often preferable to use the conductance, g = 1/R; In this form Ohm's Law is:
I = g V
2. Material that obeys Ohm's Law is called "ohmic" or "linear" because the potential difference across it varies linearly with the current.
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2006-07-06 23:29:23
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answer #2
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answered by ☆The-Siren 4
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OHM'S LAW
1. Ohm's Law deals with the relationship between voltage and current in an ideal conductor. This relationship states that:
The potential difference (voltage) across an ideal conductor is proportional to the current through it.
The constant of proportionality is called the "resistance", R.
Ohm's Law is given by:
V = I R
where V is the potential difference between two points which include a resistance R. I is the current flowing through the resistance. For biological work, it is often preferable to use the conductance, g = 1/R; In this form Ohm's Law is:
I = g V
2. Material that obeys Ohm's Law is called "ohmic" or "linear" because the potential difference across it varies linearly with the current.
3. Ohm's Law can be used to solve simple circuits. A complete circuit is one which is a closed loop. It contains at least one source of voltage (thus providing an increase of potential energy), and at least one potential drop i.e., a place where potential energy decreases. The sum of the voltages around a complete circuit is zero.
4. An increase of potential energy in a circuit causes a charge to move from a lower to a higher potential (ie. voltage). Note the difference between potential energy and potential.
Because of the electrostatic force, which tries to move a positive charge from a higher to a lower potential, there must be another 'force' to move charge from a lower potential to a higher inside the battery. This so-called force is called the electromotive force, or emf. The SI unit for the emf is a volt (and thus this is not really a force, despite its name). We will use a script E, the symbol , to represent the emf.
A decrease of potential energy can occur by various means. For example, heat lost in a circuit due to some electrical resistance could be one source of energy drop.
Because energy is conserved, the potential difference across an emf must be equal to the potential difference across the rest of the circuit. That is, Ohm's Law will be satisfied:
= I R
5. Here is a nice simulated experiment on Ohm's Law for you to test your understanding of this concept. Use the "back" button to return to this place.
OR
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OHM'S LAW
V = I x R
Where:
V = Voltage
I = Current
R = Resistance
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Example Problem:
A nine volt battery supplies power to a cordless curling iron with a resistance of 18 ohms. How much current is flowing through the curling iron?
Sketch:
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Solution:
1.) Since V(Voltage) and R(Resistance) are known, solve for I(Current) by dividing both sides of the equation by R.
2.) The R's on the right hand side of the equation cancel.
3.) I is then left in terms of V and R.
4.) Substitute in the values for V(Voltage) and R(Resistance).
5.) Solve for I(Current).
2006-07-06 23:32:37
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answer #3
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answered by Anonymous
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hey this wht ohm said " the current density is directly propotional to the product of no. of particles,charge and drift speed. if use proper substituions u will get V=IR. which is a popular interpretation.it is used to estabilish relation betweenpotential diff. and current flowing.
note:it doesnt always hold good.
2006-07-07 01:30:51
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answer #4
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answered by Anonymous
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that is for ideal conductors,i should explain it very simply that by keeping resistanc constant if u increase apllied voltage the current will be increased
2006-07-07 02:42:36
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answer #5
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answered by ghulamalimurtaza 3
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