Saturday, October 22, 2016
5.5 Troubleshooting Series Circuits
5.1 Voltage, Resistance, and Current
5.2 Ohm's Law Formula
5.4 Internal Resistance
1. Most of the problems that occur in a series circuit either come from a short circuit or an open circuit. A short circuit is where there is a current path that shouldn't exist creating more current than is desirable. An open is where a part of the circuit is not connected or not fully connected and thus the current is not flowing as it should.
There can be a direct short circuit and there can be partial shorts. A direct short circuit is where the poles of the power source are directly connected in some way to each other. This will likely mess up the power source. A partial short only by-passes some of the components.
2. The purpose of a fuse is to keep the components in a circuit from damage in the case of a short. The symbol for a fuse is:
You can locate a short using either a voltmeter or an ohmmeter. The voltmeter will tell you if there is too much voltage. Meanwhile, an ohmmeter will read 0 when it shouldn't.
3. An open circuit can also be found either with a voltmeter or an ohmmeter. When an ohmmeter is measured across an open element, it will read infinity. A voltmeter will read nothing across parts of the circuit where the open is not. But it will read full voltage across the open component.
An open circuit often results from a blown fuse or a defective switch.