Is current directly proportional to resistance?
The current in a circuit is directly proportional to the electric potential difference impressed across its ends and inversely proportional to the total resistance offered by the external circuit. The greater the battery voltage (i.e., electric potential difference), the greater the current.
Why is current directly proportional to resistance?
If we regard the voltage as fixed, then the resistance and current are inversely proportional, since their product is constant and equal to the fixed voltage. If we increase the resistance, then the current decreases, while if we decrease the resistance, then the current increases.
Why is length and resistance directly proportional?
For a given material, resistance and length formula clearly speaks that the resistance is directly proportional to its length. When the length of the material is increased, its value of resistance also increases. When the length of the material decreases, its value of resistance will also decrease.
What is the relation between resistance and area?
The relationship between resistance and the area of the cross section of a wire is inversely proportional . When resistance is increased in a circuit , for example by adding more electrical components , the current decreases as a result.
What is the relation between resistivity?
For a conductor material, the resistance of the material is inversely proportional to the area of cross-section and directly proportional to the length of the conductor. Relation between Resistivity and Resistance is: R=ρlA, where ρ is the resistivity, l is the length of the conductor and A is the cross sectional area.
Does resistivity depend on temperature?
Resistivity depends on the temperature of the material. At a constant temperature, we can assume the resistivity is a constant, and use Ohm’s Law which states that the resistance will be constant. This hinders the flow of electrons, and the resistivity increases.
What is difference between resistance and resistivity?
Resistance is the physical property of a substance because of which it opposes the flow of current i.e. electrons. Resistivity is the physical property of a particular substance which is having particular dimensions. Resistivity is only proportional to the nature and temperature of the particular material.