Aug 18, 2024
Current Definition: Current is defined as the flow of charge per unit time.
Current Formula: The current can be calculated using the formula:
[ I = \frac{n \cdot e}{t} ]
where,
When current becomes zero, the charge can be calculated using:
[ Q = I \cdot t ]
Statement: Current is directly proportional to the potential difference across the ends of a conductor.
Formula:
[ V = I \cdot R ]
where,
Definition: Resistivity is defined as the resistance of a conductor when its length is 1 meter and its cross-sectional area is 1 square meter.
Resistance Relation:
[ R \propto \frac{L}{A} ]
where,
Series Connection: The total resistance in a series circuit is the sum of individual resistances:
[ R_{total} = R_1 + R_2 + R_3 ]
Parallel Connection: The total resistance in a parallel circuit is given by:
[ \frac{1}{R_{total}} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3} ]
Potentiometer Principle: The potential drop across a conductor is directly proportional to its length.
Final Equation for Potentiometer:
[ E = \frac{R}{R + r} \cdot L ]
Resistances and lengths can be utilized to find readings and calibrations in circuits.