2007-03-10 17:44:15 · 7 answers · asked by rams 1 in Science & Mathematics ➔ Engineering
Because the wire which comprises the inductor , and the remainder of the circuit and PS, has a resistance, although it is very small.
2007-03-10 17:55:40 · answer #1 · answered by Michael T 5 · 2⤊ 0⤋
Each coil has some resistance which limits the current and as the current is very large the inductor heats up and the resistance increases so there is even a change of current in time which causes a voltage drop
2007-03-11 16:27:45 · answer #2 · answered by santmann2002 7 · 0⤊ 0⤋
No power supply in the world is without internal resistances. this is regardless if you connect it to a inductor,cap, or a superconductor. It can only supply so much even when shorted out across terminals.
(with that said back to your question)
Current flow through the inductor will give rise to a magnetic field. Because of the magnetic field being created it has now altered the path of charged particles within this field. (orbits of electrons in atoms. These charged particles oppose change and produce a countering field. This in turn gives what is referred to a imaginary resistance. Imaginary because it is only there when the inductor is energized. It's never measured directly but can be shown mathematically.
2007-03-11 03:17:17 · answer #3 · answered by volcanoone 1 · 0⤊ 0⤋
Infinite current is impossible to achieve. Infinite is just the theoretical. You're assuming that the inductor is really zero ohms. It is not. And even if we could achieve a zero ohm inductor, the power supply would not be able to provide infinite amps of current. Impossible, that's why.
2007-03-12 13:41:11 · answer #4 · answered by joshnya68 4 · 1⤊ 0⤋
Because of the internal resistance of your power supply (battery).
I=E/R still applies. But R in your circuit is not zero, your battery is not capable of providing infinite current because of the resistance within the battery itself.
If you use a mains powered power supply (filtered transformer and rectifier) with very low internal resistance current will attempt to approach infinity - but something will burn up in the process.
2007-03-11 03:17:26 · answer #5 · answered by mylitla2 2 · 1⤊ 0⤋
While resistance is an issue, and the source of power has limitations, an inductance opposes a change in current flowing through it. The inductance tends to self limit current flow.
2007-03-11 04:01:03 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Why would it ?It follows Ohm's law.
2007-03-11 03:05:12 · answer #7 · answered by Anonymous · 0⤊ 0⤋