Electric Current



I: current (A), q: charge (C), t: time



Ohm's Law



U: electric potential difference between the ends of the resistor R



Work Created By A Current (Joule's Law)




Electrical Power




Resistance



ρ: resistivity of the material (Ωm), l: length (m), A: cross-section area (a2)




Series Circuits







Parallel Circuits







Work Or Heat Energy Produced By A Resistor




Power Consumption Of A Resistor




Electromotive Force Of An Electrical Generator



W: work of force (J), q: charge(c)



Generators In Series



r: internal resistance of the generator








Generators In Parallel






Generators In Series-Parallel






Work And Power Of Generator



H: Efficiency of genarator