The ideal Voltmeter would be equivalent to an infinitely strong one of these devices.
In a mechanism analogous to that of motors, one type of these devices is composed of a wiper attached to a rotating shaft which contacts a strip of graphite. These devices are connected to the input of logic circuits to either pull it up to VCC [V sub CC] or down to ground. A Pi pad is a two port circuit composed of three of these devices. The taper is the ratio of physical adjustment to change in the strength of variable versions of these called (*) potentiometers. Circuits consisting of only these objects can be simplified by using the Y-Delta and star-mesh transforms. The ideal Voltmeter would be equivalent to an infinitely strong one of these devices. These devices are represented on circuit diagrams by a jagged line and a four colored band system indicates their strengths in Ohms. For 10 points, name these devices that impede the flow of current in a circuit.
In a mechanism analogous to that of motors, one type of these devices is composed of a wiper attached to a rotating shaft which contacts a strip of graphite.
Resistors [accept Potentiometers before mentioned]