A full area metal contact is made on the back surface, and a grid-like metal contact made up of fine " fingers " and larger " bus bars " are screen-printed onto the front surface using a silver paste.
32.
Similarly, in two adjacent conductors carrying alternating currents flowing in opposite directions, such as are found in power cables and pairs of bus bars, the current in each conductor is concentrated into a strip on the side facing the other conductor.
33.
When a circuit must be protected from overvoltage and there are failure modes in the power supply that can produce such overvoltages, the circuit may be protected by a device commonly called a crowbar across a set of bus bars ( exposed electrical conductors ).
34.
In the real world, two voltage sources connected by wires or even large copper bus bars would have the resistance of the wire or bus bar between them, and if its fraction of an ohm were put into the circuit analysis . you could calculate the huge current that would flow until something blew.
35.
In the real world, two voltage sources connected by wires or even large copper bus bars would have the resistance of the wire or bus bar between them, and if its fraction of an ohm were put into the circuit analysis . you could calculate the huge current that would flow until something blew.
36.
In " Engineering Electromagnetics ", Hayt points out that in a power station a busbar for alternating current at 60 Hz with a radius larger than one-third of an inch ( 8 mm ) is a waste of copper, and in practice bus bars for heavy AC current are rarely more than half an inch ( 12 mm ) thick except for mechanical reasons.
37.
To minimise this problem, the current connections to the standard resistor ( " R " " x " ); the sub-standard resistor ( " R " " s " ) and the connection between them ( " R " par ) is designed to have as low a resistance as possible, and the connections both in the resistors and the bridge more resemble bus bars rather than wire.
