Jamie asked in Science & MathematicsPhysics · 1 year ago

# Does resistance increase as voltage increases?

I'm assuming the answer would be yes? Because as voltage increases, electrons move faster and then make more and more collisions with the lattice? could someone confirm this please.

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• oubaas
Lv 7
1 year ago

By increasing V on a certain R you increase I and then joule losses P = R*I^2 or P = R*(V/R)^2 = V^2/R

All this leads to a higher temperature T and since resistivity ρ ≡ T , then the resistance will increase : how much ?

It depends upon the material : talking about copper ,the relevant equation is :

Rx = Ro(234+Tx)/(234+To)

if To = 20°C and Tx = 120°, then Rx = Ro*1.394 which means and increment close to 40%

• goring
Lv 6
1 year agoReport

Temperature causes expansion of the cross section area of the conductor.power is the product of voltage and velocity

• Anonymous
1 year ago

Rx = Ro(234+Tx)/(234+To)

if To = 20°C and Tx = 120°, then Rx = Ro*1.394 which means and increment close to 40%

• 1 year ago

No, look back at the Ohms law

• Anonymous
1 year ago

Yes.

• John
Lv 4
1 year ago

No. Resistance remains the same. Current flow can change due to frequency according to the math.

That's usually known as impedence.

Resistance and impedence are similar but not exactly the same.

• cosmo
Lv 7
1 year ago

It depends on the material. In a "resistor", ideally the resistance is constant under all conditions (and probably changes a little with temperature). A Zeiner diode is constructed so that, in the back current direction, the resistance does increase with voltage.

• 1 year ago

it depends

• 1 year ago

It depends on the circuit. In some non linear loads the Resistance does change. but if it is a linear load R is a fixed quantity and as Voltage increases so does current.