Why resistivity does not depend on length and area?

Why resistivity does not depend on length and area?

Larger cross sections have less resistance, and longer conductors have more resistance. Therefore, by multiplying resistance by area and dividing by length, you get a value for a material property (resistivity ρ) that doesn’t depend on the size of the conductor….

What happens to resistivity when temperature increases?

The general rule is resistivity increases with increasing temperature in conductors and decreases with increasing temperature in insulators. As temperature rises, the number of phonons increases and with it the likelihood that the electrons and phonons will collide. Thus when temperature goes up, resistance goes up.

Does resistance depend on temperature?

Since the resistance of some conductor, such as a piece of wire, depends on collisions within the wire itself, the resistance depends on temperature. With increasing temperature, the resistance of the wire increases as collisions within the wire increase and “slow” the flow of current.

Does voltage increase when resistance decreases?

The current is directly proportional to the voltage and inversely proportional to the resistance. This means that increasing the voltage will cause the current to increase, while increasing the resistance will cause the current to decrease….

Does increasing voltage increase resistance?

Ohm’s law states that the electrical current (I) flowing in an circuit is proportional to the voltage (V) and inversely proportional to the resistance (R). Therefore, if the voltage is increased, the current will increase provided the resistance of the circuit does not change.

What happens to voltage when resistance decreases?

Voltage, Current and Resistance Summary This means that if the voltage is high the current is high, and if the voltage is low the current is low. Likewise, if we increase the resistance, the current goes down for a given voltage and if we decrease the resistance the current goes up.

Does higher ohms mean higher resistance?

Ohms are units of resistance. The lower the resistance of your atomizer, the larger the amount of current flowing through it. If you increase resistance, the atomizer receives less current. Also, the relationship between voltage (Volts) and resistance (Ohms) is important.

What wattage should I vape at 0.8 ohm?

around 12watts