Shivansh Mathur said:
Electric resistance is the measure of an object's opposition to the flow of electric current. It is measured in ohms (Ω) and is influenced by factors such as the material, size, and temperature of the object.
The dimensions of an object, such as its length, cross-sectional area, and shape, can impact its electrical resistance. Generally, longer and thinner objects have higher resistance, while shorter and thicker objects have lower resistance.
According to Ohm's Law, there is a direct relationship between electric resistance and current. This means that as resistance increases, current decreases, and vice versa. The equation is R = V/I, where R is resistance, V is voltage, and I is current.
Temperature plays a significant role in electric resistance. In most materials, as temperature increases, resistance also increases. This is because higher temperatures cause more collisions between electrons and atoms, impeding the flow of current.
Yes, electric resistance can be reduced or eliminated by using materials with low resistance, such as copper or silver, or by increasing the cross-sectional area of an object. Additionally, superconductors have zero resistance at very low temperatures, allowing for the flow of electricity without any hindrance.