Electrical Energy & Capacitance Pgs. 665 - 682

Potential Difference Electric potential The electrical potential energy associated with a charged particle divided by the charge of the particle The electrical potential at a point is independent of the charge at that point

SI unit for potential difference – volt (V) The change in electrical potential SI unit for potential difference – volt (V)

An ion is displaced through a potential difference of 40 An ion is displaced through a potential difference of 40.0 V and experiences an increase of electrical potential energy of 2.23 x 10-17 J. Calculate the charge on the ion.

The potential difference in a uniform field varies with the displacement from a reference point Magnitude of the electric field (E) in this equation has units of V/m

A 1.5 V battery is connected across two parallel metal plates separated by .24 cm. Find the magnitude of the electric field.

The reference point for potential difference near a point charge is often infinity An electric potential exists at some point in an electric field regardless of whether there is a charge at that point

Find the potential difference between a point infinitely far away and a point 2.5 cm from a proton.

A battery does work to move charges 1 C of charge starts at the Negative terminal - ∆V = 0 Electric field works to move the charge to the Positive terminal - ∆V = 12 As the charge moves back to the negative terminal, it gives up the 12J to the external devices