ELECTRICITY Short notes: * Electric current and circuit * Electric potential and potential difference * Circuit Diagram * Ohm's Law *Combination of Resistance * Series combination of resistance * parallel combination of resistance * Heating Effect of electric current * Electric power 1) Electric current and circuit: I= Q/t where I= electric current Q= charge t= time S.I unit of , I= ampere Q= coulomb t= sec 2) Electric potential and potential difference : V= W/ Q where V = potential difference w= work Q= charge S.I unit of V= volt w= joule Q= coulomb 3) Circuit Diagram: 4) Ohm's Law : V= IR => R= V/I =>I= V/R where V = potential difference R= Resistance I= Electric current S.I unit of R=