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Parallel circuits : ウィキペディア英語版
Series and parallel circuits

Components of an electrical circuit or electronic circuit can be connected in many different ways. The two simplest of these are called series and parallel and occur frequently. Components connected in series are connected along a single path, so the same current flows through all of the components.〔Resnick ''et al.'' (1966), Chapter 32, Example 1.〕〔Smith, R.J. (1966), page 21〕 Components connected in parallel are connected so the same voltage is applied to each component.〔(incorrect)〕
A circuit composed solely of components connected in series is known as a series circuit; likewise, one connected completely in parallel is known as a parallel circuit.
In a series circuit, the current through each of the components is the same, and the voltage across the circuit is the sum of the voltages across each component.〔 In a parallel circuit, the voltage across each of the components is the same, and the total current is the sum of the currents through each component.〔
Consider a very simple circuit consisting of four light bulbs and one 6 V battery. If a wire joins the battery to one bulb, to the next bulb, to the next bulb, to the next bulb, then back to the battery, in one continuous loop, the bulbs are said to be in series. If each bulb is wired to the battery in a separate loop, the bulbs are said to be in parallel. If the four light bulbs are connected in series, there is same current through all of them, and the voltage drop is 1.5 V across each bulb, which may not be sufficient to make them glow. If the light bulbs are connected in parallel, the currents through the light bulbs combine to form the current in the battery, while the voltage drop is 6.0 V across each bulb and they all glow.
In a series circuit, every device must function for the circuit to be complete. One bulb burning out in a series circuit breaks the circuit. In parallel circuits, each light has its own circuit, so all but one light could be burned out, and the last one will still function.
== Series circuits ==
Series circuits are sometimes called ''current''-coupled or daisy chain-coupled. The current in a series circuit goes through every component in the circuit. Therefore, all of the components in a series connection carry the same current. There is only one path in a series circuit in which the current can flow. The formula to search resistance in series is Rs = R1 + R2 + R3 .... Rn
A series circuit's main disadvantage or advantage, depending on its intended role in a product's overall design, is that because there is only one path in which its current can flow, opening or breaking a series circuit at any point causes the entire circuit to "open" or stop operating. For example, if even one of the light bulbs in an older-style string of Christmas tree lights burns out or is removed, the entire string becomes inoperable until the bulb is replaced.
=== Current ===
:
I = I_1 = I_2 = I_3 = \dots = I_r

In a series circuit the current is the same for all of elements.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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