17.2 Ohm's Law

The net flowing of electric charge in a conductor leads to electrical current. Motion of a charge particle, say an electron experiences collisions with other electrons and positive ions in the conductor leading to resistance, denoted by R which is a circuit element.

Because of the resistance, electric charges will not flow without a voltage source driving driving it. The expirical relationship between the electric current and voltage is given by

Ohm's Law

V = IR

(Volt = Amp x Ohm)

Capacitors store energy in a circuit, calculated in Chapter 16.

Resistors dissipate energy in a circuit calculated below:

Energy and Power Dissipated in a Resistor

Energy= Dq x V

Power = Energy/Time = Dq x V/Dt

= IV = RI**2 = V**2/R

 

Study Examples: 17.7; 17.8 on your own, ask me if you have questions

 

HW: P7, P37, P67