pls, i need accurate answers
2006-12-06 07:30:41 · 6 answers · asked by amandac 3 in Science & Mathematics ➔ Physics
If it's just plain resistance and not an active device like a transistor, the resistance remains a constant unless of course it overheats because of excess current and changes value.
2006-12-06 07:34:08 · answer #1 · answered by Gene 7 · 1⤊ 1⤋
Resistance is dependent on properties of the conductor and the applied emf has nothing to do with the resistance. It is misleading from ohms law to assume that holding the current steady and varying the voltage will vary the resistance. The resistance is based on R = p( Greek ro) l (for length) / A(area)
p is given in various tables and occasionally in better periodic tables and is the resistivity of a specific material. This value of p may change with temperature but does not change with voltage or current, directly, for normal everyday conductors.
2006-12-06 07:55:41 · answer #2 · answered by Anonymous · 0⤊ 0⤋
If I had to guess, what you're looking for is the V=IR equation (voltage(V) = current(I) * resistance(R)). Thus, if you increase the voltage and the current stays the same, the resistance would need to go up as well (to prevent blowing something apart!).
2006-12-06 08:39:48 · answer #3 · answered by Jen 1 · 0⤊ 1⤋
well voltage increasing will not directly do anything to the resistance, however if you keep the resistance the same, and increase the voltage, the current will increase.
2006-12-06 07:35:21 · answer #4 · answered by Anonymous · 0⤊ 0⤋
In an ideal circuit, it will not change. In a real circuit, it will change (perhaps substantially) because of heating. In classroom work, assume the former unless conditions clearly call for the latter.
2006-12-06 07:34:41 · answer #5 · answered by Anonymous · 0⤊ 1⤋
Nothing.
2006-12-06 10:47:51 · answer #6 · answered by Nomadd 7 · 0⤊ 0⤋