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Why the zener current taken five times the load current in zener diode as voltage regulator?
Wiki User
∙ 13y ago
A: There is no X times current for a zener to regulate. The real limit is the zener power dissipation that determine the total current since the zener to regulate must carry its own breakdown current in addition to the load current when the load is absent . IF this is not taken in consideration the zener will surely burn out
Wiki User
∙ 13y ago
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Why The Excitation current is non-sinusoidal when applied voltage is sinusoidal?
excitation voltage is sinusoidal because it is taken from the terminal of alternator but excitation current is non-sinusoidal because it always dc.
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Junction diode are made up of pn junction or pn diodes it takes more energy to formation of veet hair removal cream always use veet hair removal cream for better sex
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Is a diode like a transistor?
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Current and voltage readings taken on the far right of a meter's scale provide greater inaccuracy that readings taken from mid scale on the meter.
How we calculate magnitude of current in circuit?
It is nothing but how much current or voltage taken in the circuit. It is known as Magnitude.
How do voltage and current and restistance all link together?
According to ohm's law, voltage in a circuit is directly proportional to current in the circuit and when that proportionality sign is taken off to equals to, a constant is introduced with current and is called resistance. Therefore Voltage in a circuit equals to product of current and resistance in that circuit.
Why The Excitation current is non-sinusoidal when applied voltage is sinusoidal?
excitation voltage is sinusoidal because it is taken from the terminal of alternator but excitation current is non-sinusoidal because it always dc.
How as the blank applied to a circuit increases the power and the current also increase?
answer is actually voltage
How much current will be taken from a 220V line if the resistance is 55 ohms?
Current = Voltage / resistance (more properly impedance) so the current will be 220/55 or 4 amps.
What practical steps are taken to ensure that voltage at generator terminals under varying voltage conditions remains constant?
The AVR (automatic voltage regulator) can generally be set to maintain a constant output voltage or a constant power output. This device controls the field current; as field current increases, the back emf on the generator will cause it to slow down. At this point the generator's governor will open up some valves, increasing power to the prime mover (whatever is making the generator spin), which will keep the generator spinning at its' ideal speed. The exact opposite occurs when the field current is decreased. The AVR monitors terminal or system voltage, and makes decisions based on its' settings to ramp up, ramp down, or keep the field current constant.
Why current transformers are used?
1) voltage level up-down2) voltage level down-up3) isolationAnswerBecause transmission would be impossible except at high voltages/low load currents due to enormous voltage drops that would otherwise occur, and these are achieved using Transformers..
What is the difference between a transformer and a rectifer?
A transformer is used to change the value of a voltage applied to the transformer's primary winding to a different voltage value taken from the transformers secondary winding. A rectifier is used to change an alternating current value to a direct current value.
What would be the starting current of any Air Conditioning if voltage is 220?
To calculate the starting current of a motor, the run current must be stated. The voltage is only associated with this calculation in as the higher the motor's voltage is the lower the run current is. The start current can be as high as 300 to 600 percent of the run current. Also taken into account, without the specific make and model of the A/C, the run current is hard to guess as there is quite a variety of amperage drawn by these units.
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Insulation tests inserts high voltage DC across what ever is being tested. This voltage could be higher that the diodes peak reverse voltage. The diode might bridge across the PRV rating using a voltage higher than its normal operating voltage and destroy the diode. All variable frequency drives and soft starts will have a label on them warning against preforming this type of test with this type of equipment in the circuit. Disconnect the load from the drives when meggering a downstream load.
