What effects do temperature have on Ohm's Law?

Question

I've been looking everywhere, and I haven't found out a detailed explanation of the effects of temperature on Ohm's law. I know that an increase in temperature means an increase in resistance, and thus a decrease in current, in order for voltage to remain constant. But my teacher says that I need to elaborate a lot more on this. Can someone help me?? Thanks heaps!

Answer 1

Resistance of a conductor is due to the collisions which the free electrons encounter with the atoms (or ions) of the lattice. As temperature of the conductor (or resistor) increases, the amplitude of the vibration of the ions in the lattice increases. This increases the probabilty of collision of free electrons with them. Thus, the lattice atoms offer a bigger target for collisions. The "drift velocity: thus decreases. This decreases current. Hence resistance of the conductor increases.

Answer 2

When the temperature of the conductor increases, the collisions between electrons and atoms increase. Thus as a substance heats up because of electricity flowing through it (or by any heating process), the resistance will usually increase. The exception is semiconductors. The resistance of an Ohmic substance depends on temperature in the following way:

R=L/A.p(rho)=L/T.p0(@(T-T0)+1

where ρ is the resistivity, L is the length of the conductor, A is its cross-sectional area, T is its temperature, T0 is a reference temperature (usually room temperature), and ρ0 and @ are constants specific to the material of interest. In the above expression, we have assumed that L and A remain unchanged within the temperature range.

It is worth mentioning that temperature dependence does not make a substance non-ohmic, because at a given temperature R does not vary with voltage or current (V / I = constant)

Answer 3

Temperature has NO effect on Ohm's law. Ohm's law holds at all temperatures. Temperature can affect the value of the "R" part of the law, but the law is still valid.

Temperature increase does not always cause a resistance increase. This is true in metals, but not in semiconductors, where the opposite happens.

Answer 4

Ohm's regulation defines the relationships between (P) potential, (E) voltage, (I) modern-day, and (R) resistance. One ohm is the resistance value by which one volt will preserve a modern-day of one ampere. ( I ) modern-day is what flows on a cord or conductor like water flowing down a river. modern-day flows from factors of intense voltage to factors of low voltage on the exterior of a conductor. modern-day is measured in (A) amperes or amps. ( E ) Voltage is the version in electric powered skill between 2 factors in a circuit. it incredibly is the frenzy or stress in the back of modern-day flow by a circuit, and is measured in (V) volts. ( R ) Resistance determines how plenty modern-day will flow by a piece. Resistors are used to regulate voltage and modern-day tiers. an fantastically intense resistance enables a small quantity of modern-day to flow. an fantastically low resistance enables an excellent quantity of modern-day to flow. Resistance is measured in ohms. ( P ) potential is the quantity of modern-day situations the voltage point at a given component measured in wattage or watts. E = I x R (Voltage = modern-day accelerated via Resistance) R = E / I (Resistance = Voltage divided via modern-day) I = E / R (modern-day = Voltage Divided via Resistance) P = E x I (potential = Voltage accelerated via modern-day) incredibly, in case you have any 2 accepted values, you could verify the others.

Answer 5

i = v / Δr. there u go. now consider what u want to remain constant and think about what would happen