Current Electricity

Electric current (I) is defined as

Electric current (I) is defined as the net charge flowing across a cross-section per unit time: I = ΔQ/Δt (in amperes, A). It represents the flow of c

When an electric field is applied

When an electric field is applied to a conductor, free electrons experience a force (F = -eE) and accelerate. However, they frequently collide with po

Ohm's Law states that the potential

Ohm's Law states that the potential difference V across a conductor is directly proportional to the current I flowing through it: V = IR, where R is r

Resistance R depends on both

Resistance R depends on both the material (through resistivity ρ) and geometry of the conductor: R = ρl/A, where l is length and A is cross-sectional

When current flows through a resistor

When current flows through a resistor, electrical energy is dissipated as heat. Power dissipated is P = VI = I²R = V²/R (in watts). This energy comes