EE 2120 Chapter : 3 Voltage
Document Summary
Measure of the energy transferred per unit of charge when charge moves from one point in an electrical circuit to a second point. A voltage source is analogous to a pump. The voltage associated with a circuit element is the energy transferred by unit charge that flows through the element. Voltage is the energy (or work) needed to move a unit charge from a to b; Voltage w: energy in joules (j) q: charge in coulombs(c) Example 4: the voltage across a given circuit element is (cid:3028)(cid:3029) A positive charge of 2 c moves through the circuit element from terminal b to terminal a. Is the energy supplied by the circuit element or absorbed by it? (cid:2183)(cid:2184) Voltage across an element (+) and (-) signs are used to define the voltage polarity or the voltage reference direction. Voltage between points a and b is defined as: An arrow can be used to represent the voltage polarity (drop or rise)
