Aim;To find how the current through a conductor varies with the potentoal difference between its ends
2007-01-25 08:59:23 · 6 answers · asked by D@ni DiC@prio 4 in Science & Mathematics ➔ Physics
According to OHMS LAW current is directly proportional to p.d. Therefore when the p.d is doubled or trebled the current also gets doubled or trebled respectively.
2007-01-27 02:09:11 · answer #1 · answered by laminewton 2 · 0⤊ 0⤋
This depends on a lot of parameters you have left out. Ohm's Law I=V/R where the current (I) is the result of a potential difference (V) across a conductor with resistance (R). With no load between the ends you are only limited by the material the condutor is made of, i.e. copper, and the cross sectional surface area of the material, i.e. area of a circle for a wire which is related to its gage. In this case the resistance of the conductor (R) = (rho)*l/A, where rho is the resistivity of the substance, has to be looked up, l is the length of the conductor, or wire, and A is the cross sectional area of the conductor.
From this you could know the resistance of the material but then temperature will come into play as the voltage/current increases. At some point the temperature will rise (as temp increases, resistance increases) so high that the conductor will not be able to produce more current for more voltage and will eventually burn out and produce an open.
If there is a sufficient load between the potential difference it is a direct relationship between the current and voltage as long as the resistance remains the same. Double the voltage = double the current. Triple the voltage = triple the current. This is only for the simplest of systems though.
2007-01-31 12:31:44 · answer #2 · answered by Scott 2 · 0⤊ 0⤋
Ohms came up with the following formula V=I*R , where V is the voltage, I is the current flowing, and R the resistance it is flowing through. R can be considered a constant for your experiment.
So, it becomes clear that when you change the p.d. the current will change in the same fashion. ie) the current doubles and trebles.
2007-01-30 19:35:26 · answer #3 · answered by lester_day 2 · 0⤊ 0⤋
Use Ohm's Law, V=IR. If resistance is constant, voltage changes in proportional to current.
2007-01-25 17:06:40 · answer #4 · answered by Anonymous · 2⤊ 0⤋
try looking for ohm's law
2007-02-01 05:58:31 · answer #5 · answered by monalisa three 5 · 0⤊ 0⤋
complicated point. check out onto bing and yahoo. just that may help!
2014-11-15 04:53:29 · answer #6 · answered by Anonymous · 0⤊ 0⤋