2006-08-21 04:05:52 · 7 answers · asked by Vincent D 1 in Science & Mathematics ➔ Physics
For most materials, the current that goes through them is proportional to the voltage. In that case, the constant of proportionality is called the resistance:
R=U/I
Note that resistance is a property of an electronic component, not of the material that it's made of, since it also depends on the length and thickness. So you can't talk about the resistance of copper, for example. You can talk about the resistance of a particular copper wire.
2006-08-21 04:20:31 · answer #1 · answered by helene_thygesen 4 · 0⤊ 0⤋
A kink in a water pipe is what resistance is to electricity. The higher the value of resistance in a circuit the less current can get through.
2006-08-21 16:26:58 · answer #2 · answered by Buffertest 3 · 0⤊ 0⤋
By definition resistance = voltage / amperage.
In fact V = IR is not a law (of Ohm). It is only a definition !!!
Proportionally is never exactly, since all the three quantities can change simultaneously !!
Th
2006-08-21 04:25:11 · answer #3 · answered by Thermo 6 · 0⤊ 0⤋
A resistor is a component which limits the current at a given voltage to a specific value, and transforming excess power into heat.
Or something like that (English nix goot)
2006-08-21 04:19:57 · answer #4 · answered by Marianna 6 · 0⤊ 0⤋
Its nothing but the opposition to the flow of electrons inside a conducting wire.
2006-08-21 04:40:37 · answer #5 · answered by Anonymous · 0⤊ 0⤋
resistance is nothing but opposition of flow of charge thru the circuit
2006-08-21 04:18:20 · answer #6 · answered by santosh k 1 · 0⤊ 1⤋
Don't you mean contact resistance?
2006-08-21 04:20:05 · answer #7 · answered by Fredrick Carley 2 · 0⤊ 0⤋