If the wires aren’t connected properly, then you will have reversed polarity and the result is the current going in the opposite direction of which it is intended. Neutral wires, which are typically white or gray, should be connected to the lighter-colored, chrome terminal. Positive wires, which are typically red or black, should be connected to the brass terminal. You should turn off your domestic electricity supply before inspecting the wiring. If you discover that one of your home’s wall outlets has reversed polarity, correcting the problem isn’t difficult, however, you need to be careful you aren’t shocked or electrocuted. A flashing negative sign (“-”) before the numerical reading on the meter indicates that the polarity is incorrect. Testing with a multimeter usually involves touching positive and negative leads from the meter to the wiring being tested. In an alternating current (AC) circuit the two poles alternate between negative and positive with the direction of the electrons flowing in reverse.Īlternating current ( AC) can be tested with a multimeter or volt ohm meter. In a direct current (DC) circuit, one pole is always negative and the other pole is always positive with the electrons only flowing in one direction. When the two poles are connected by a wire, electrons flow from the negative pole toward the positive pole. The pole with fewer electrons then has a positive polarity. The pole with more electrons is said to have negative polarity. In the case of electric current running between two points, or poles, one of the poles will have more electrons than the other. Polarity is defined as, the condition of a body or system in which it has opposing physical properties at different points, especially, magnetic poles or electric charge. Polarity is a term used in electricity, magnetism and electronic signaling, just to name a few areas.
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