internal impedance การใช้

• The internal impedance is complex and may be interpreted as a resistance in series with an inductance.
• However, an amplifier with a low internal impedance delivers more electrical output power when the load impedance reduces ( until the impedances become approximately matched ).
• Loudspeaker efficiency is measured with respect to nominal power in order to emulate the situation outlined above where a low internal impedance amplifier is used with a loudspeaker.
• :A lot of modern LED flashlights seem to skip the limiting resistor and just count on the battery's internal impedance to limit the current flow.
• If the input voltage source has some internal impedance Z _ { int } or if it is connected through another impedance element, a positive feedback appears.
• They may implement a shunt across the transmitter circuit and induction coil to maximize the pulsing signal of the dial by eliminating all internal impedances of the telephone set.
• This permits a loudspeaker to be used with an amplifier having a low internal impedance and a flat frequency response is realized for the combined amplifier / loudspeaker system.
• The input voltage source has to have internal impedance Z _ { int } > 0 or it has to be connected through another impedance element to the input.
• A generator with an internal impedance ( i . e . non-ideal generator ) can be represented as either an ideal voltage generator or an ideal current generator plus the impedance.
• In many cases, the input voltage source has some internal impedance Z _ { int } or an additional input impedance is connected that, in combination with " Z ", introduces a feedback.
• If the prospective short circuit current from the utility source is very large compared to the customer's system size, an " infinite bus " is assumed, with zero effective internal impedance; the only limit to the prospective short circuit current is then the impedances after the defined " infinite bus ".
• :If you been using it a lot since you got it, then depending on the current consumption, and the state of the battery when you bought it, it is conceivable that your battery is discharged somewhat . the squealing noise sounds a bit like what you may get with a battery that has gone high internal impedance.
• Due to the higher cell voltage, fewer cells are required for a given pack voltage than for NiCd and NiMH . They also have low internal impedance ( typically 5 milliohms ), which allows for high battery discharge rates, up to 50 " C " . ( " C " is battery capacity in Ah, divided by one hour .)
• For this purpose, some circuits are driven by a constant current source or by a real voltage source with internal impedance : current-to-voltage converter ( transimpedance amplifier ), capacitive integrator ( named also current integrator or charge amplifier ), resistance-to-voltage converter ( a resistive sensor connected in the place of the impedance " Z " ).
• The finished glass pieces are illuminated by either a neon sign transformer or a switched-mode power supply, usually running at voltages ranging between 2 15 kV and currents between 18 and 30 mA ( higher currents available on special order . ) These power supplies operate as constant-current sources ( a high voltage supply with a very high internal impedance ), since the tube has a negative characteristic electrical impedance.