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2. Series and parallel circuits - Wikipedia

   en.wikipedia.org/wiki/Series_and_parallel_circuits

   In a parallel circuit, the voltage across each of the components is the same, and the total current is the sum of the currents flowing through each component. [1] Consider a very simple circuit consisting of four light bulbs and a 12-volt automotive battery. If a wire joins the battery to one bulb, to the next bulb, to the next bulb, to the ...

3. Split-phase electric power - Wikipedia

   en.wikipedia.org/wiki/Split-phase_electric_power

   Wiring regulations govern the application of split-phase circuits so that the shared neutral can be protected from excess current. A neutral wire can be shared only by two circuits fed from opposite lines of the supply system, using circuit breakers connected by a bar so that both trip simultaneously ( [ 4 ] NEC 210.4); this prevents 120 V from ...

4. Polyphase system - Wikipedia

   en.wikipedia.org/wiki/Polyphase_system

   One voltage cycle of a three-phase system. A polyphase system (the term coined by Silvanus Thompson) is a means of distributing alternating-current (AC) electrical power that utilizes more than one AC phase, which refers to the phase offset value (in degrees) between AC in multiple conducting wires; phases may also refer to the corresponding terminals and conductors, as in color codes.

5. Two-phase electric power - Wikipedia

   en.wikipedia.org/wiki/Two-phase_electric_power

   Two-phase power can be derived from a three-phase source using two transformers in a Scott connection: One transformer primary is connected across two phases of the supply. The second transformer is connected to a center-tap of the first transformer, and is wound for 86.6% of the phase-to-phase voltage on the three-phase system.

6. Uninterruptible power supply - Wikipedia

   en.wikipedia.org/wiki/Uninterruptible_power_supply

   The main 50/60 Hz transformer used to convert between line voltage and battery voltage needs to provide two slightly different turns ratios: One to convert the battery output voltage (typically a multiple of 12 V) to line voltage, and a second one to convert the line voltage to a slightly higher battery charging voltage (such as a multiple of ...

7. Synchronization (alternating current) - Wikipedia

   en.wikipedia.org/wiki/Synchronization...

   [2] The voltage, frequency and phase angle must be controlled each time a generator is to be connected to a grid. [1] Generating units for connection to a power grid have an inherent droop speed control that allows them to share load proportional to their rating. Some generator units, especially in isolated systems, operate with isochronous ...