1.5 Practical Two-Terminal Elements

• Power delivered by battery is the product of voltage and current : p = VI
• If a constant amount of power p is delivered over an interval T, the energy w supplied is : w = pT
• Ohm's law : v = iR
• An open circuit is an element through which no current flows, regardless of its terminal voltage
• A short circuit is an element across which no voltage can appear regardless of the current through it
• A two-terminal resistor is any two-terminal element that has an algebraic relation between its instantaneous terminal current and its instantaneous terminal voltage
• Associated Variables Convention define current to flow in at the device terminal assigned to be positive in voltage