I Connected the Phone Jack to the Correct Colored Wires and My Meter Reads Reverse Polarity
Electric polarity is a term used throughout industries and fields that involve electricity. At that place are two types of poles: positive (+) and negative (−). This represents the electrical potential at the ends of a circuit. A bombardment has a positive terminal (+ pole) and a negative terminal (− pole). Interconnection of electric devices nearly ever crave right polarity to be maintained. Correct polarity is essential for the operation of vacuum tube and semiconductor devices, many electric motors, electrochemical cells, electrical instruments, and other devices.
Current management [edit]
Conventional electric current flows from the positive pole (terminal) to the negative pole. Electrons flow from negative to positive. In a direct current (DC) excursion, current flows in one direction merely, and one pole is always negative and the other pole is always positive. In an alternating electric current (AC) circuit the ii poles alternate between negative and positive and the direction of the current (electron flow) reverses periodically.
Conventions for identification [edit]
Polarity symbols are used where the polarity of a final or wire must be identified. An electric colour code or other conventions may be used. In DC circuits, the positive pole is usually marked carmine (or "+") and the negative pole is usually marked blackness (or "−"), but other color schemes are sometimes used in automotive and telecommunications systems.
On a car battery, the positive pole usually has a larger diameter than the negative pole. Modern cars accept the negative terminal of the battery continued to the vehicle's body, and the positive concluding provides the live wire to the various systems. Older cars were congenital with the positive last of the battery bonded to the chassis.
Air-conditioning systems [edit]
In AC systems the two wires of a circuit alternate polarity many times per 2d. In electrical power systems, all wires carrying the same instantaneous polarity at any moment will have a common identifying mark scheme, such equally wire color. Depending on the conventions used for wiring the power system, the color coding or other marking may also indicate additional properties of the conductor, such as its role as neutral in a power circuit. In a polyphase AC system, identifying the wires belonging to a common phase is of import to ensure proper operation of the circuit.[1]
Where alternate current circuits are used to carry signals such equally audio, polarity is likewise required to ensure proper part of the system. For example, a set of loudspeakers used for stereo music reproduction will have all device terminals and wiring marked to ensure the same instantaneous polarity, so that the resulting sound produced past each speaker chemical element is in the same stage and add correctly at the listener's ear.
Testing for polarity [edit]
Instruments such equally analog voltmeters will betoken upwardly-calibration when the musical instrument's negative lead is connected to the negative pole of a device under test, and the positive lead to the positive terminal. A reversed analog instrument will indicate down-calibration, forcing the pointer against the scale stop stop; this may damage a sensitive instrument. Digital instruments may bespeak reverse polarity of connection with a minus sign before the numerical measurement. A test lite using a neon glow lamp will indicate polarity by inspection of the glow around the lamp electrodes; the electrode connected to the negative pole of the circuit volition have a glow around it. A neon lamp connected to Ac will take a glow visible at both terminals.[2]
Testing of polarity in alternate current arrangement can exist done by an instrument such as a dual-trace oscilloscope that can identify when 2 points accept instantaneously similar voltages, or by measurement between terminals with a voltmeter. If the two points are of the same polarity ( "in-phase"), voltage will be a minimum.
See also [edit]
- Air-conditioning polarity inversion
- Anode
- Cathode
- Diode and diode bridge
- Electric charge
- Fuse (electric)
- Polarity (mutual inductance)
References [edit]
- ^ Wilford Summers, (ed)., American Electricians' Handbook Eleventh Edition, McGraw Hill, 1987, pp. seven-46 through 7-47
- ^ Wilford I Summers, American Electricians' Handbook, Eleventh edition, McGraw Hill, 1987, ISBN 0-07-013932-6, page ane-55
External links [edit]
- Reverse battery or DC polarity protection.
Source: https://en.wikipedia.org/wiki/Electrical_polarity
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