The A - Z Of What Are Electric Cables > 자유게시판

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An electrical wire is the electro technical component used to transport electricity to transmit energy and information. When considering the behavior of real-world circuits, it is often essential to understand the actual resistance, capacitance, or inductance of signal pathways that may consist of more than one discrete component. As the frequency increases, however, the signal will get more and more attenuated - and the phase shift will become greater - as the source can't charge or discharge the capacitor quickly enough. A current will be allowed to flow through the lightbulb, discharging the capacitor in a familiar manner, with discharge time governed by capacitance and the equivalent resistance of the driven device. Unfortunately, diodes have a highly non-linear I-V curve - so when we connect 9V, its resistance will suddenly drop, several amps will be allowed flow through the junction; and the whole thing could - nay, will - catch fire. If the resulting flow of charges is slow enough, they will simply drain through the resistor; but if the rate of change is very high, the resistor will limit the current, and develop a substantial, momentary voltage difference across its terminals.

The circuit simply divides supply voltage by a desired factor - and in this, lies its utility. IR); the output voltage of the circuit will be identical to that of the supply - and will drop quickly, but thanks to parasitic capacitances not instantaneously, when the load is connected again. Thevenin's theorem is a sometimes useful analytic tool, too: it gives a method for replacing any network of resistors, voltage sources, and current sources, with a single voltage source and a single resistor. In other words, practical resistor-based voltage dividers can be considered medium to high impedance sources, and should not be driving low impedance loads. A more interesting case is what happens when both switches are switched on at the same time: assuming the non-linearity of the lightbulb is negligible (which is fair if the capacitor is large enough), initially, the capacitor will offer a low-impedance path, with very little current flowing through the bulb; but as the charge builds up, the voltage across its terminals will begin to rise - and more current will flow through the bulb. When a signal is 10 to 15 times more powerful than that of an adjacent channel station, most receivers become unable to receive the weaker station.

In the circuit shown on the left, the capacitor will be charged or discharged by any (sufficiently low-impedance) input signal at a rate controlled solely by the resistor; with the capacitor discharged, the output voltage will start at zero, and will begin approaching the input voltage only if the signal is applied for long enough (3RC or so). Electrical cable size can be determined based on three essential factors voltage regulation, current carrying capacity & short circuit rating. The sizing of final electrical wiring must be in accordance with the connected load on each circuit. Ring Type Electrical Wiring: A ring type electrical wiring which is connected from a single protective device, being run through an area to be supplied (via appropriate socket outlets, switched flex outlets, etc.) and returning back to the same protective device, thus forming an electrically continuous loop. When the expected range of R3 values to be seen by the circuit is much higher than the value of R2, the effect is negligible - but when R2 and R3 are in the same league, the resulting voltage drop may become significant. 2RbulbC (15% of supply voltage), it will probably go completely dark. This divider is not a perfect voltage source, however: when you connect any resistive load (R3) between A and B - for example, the lightbulb shown on the schematic - it will introduce a new resistance parallel with R2.

Similarly to MOSFETs, there is also a minimum base-emitter voltage required to overcome the potential of the BE junction (VBE), usually in the 0.6V - 0.8V range. In normal operation, collector is connected to a more positive region, and emitter is more negative; in this configuration, the B-C junction is reverse biased and does not conduct. 5RC, the capacitor will be more than 99% charged, with almost no current flowing - and a voltage equivalent to that of the power source will be present across its terminals. Exactly the same rules apply to the inductance and power ratings of inductors; and the voltage and current capability of voltage supplies. This latter calculation is somewhat cumbersome, but for simplicity, it's good to remember that any number of identical resistors in parallel will have an equivalent resistance equal to R/count, and the power rating will increase accordingly; and that if and if one of the resistors in parallel has a resistance several orders of magnitude lower than the rest, the resistances and power ratings of the remaining resistors may often be safely ignored altogether. This device is also not a perfect current limiter: if the apparent resistance of the driven device drops during normal operation, a more significant current will be allowed to flow.

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