10
1.4 Voltage
(1)
•Voltage (or potential difference) is the energy required to move a unit charge through an element, measured in volts (V).
•Mathematically,
(volt)
–w is energy in joules (J) and q is charge in
coulomb (C).
•Electric voltage, vab, is always across the circuit element
or between two points in a
circuit.
–vab > 0 means the
potential of a is higher than potential of b.
–vab < 0 means the potential of a is
lower than potential of b.
