0
Why use a step down trans former when the lower voltage is available?
Wiki User
∙ 14y ago
The secondary winding of a double wound transformer is 'floating' in that it is not referenced to any other part of the circuit. You choose how to reference it. You cannot accomplish this without a transformer.
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
What are practical applications of a transformer coupled amplifier?
Well the purpose of the transformer in an amplifier is impedance matching. Lets say the transformer is on the input of a audio amp. Now the amp circuitry has an input impedance (this is important because matching the impedance gives us maximum power transferred from the input signal source to the amp circuit, and that increases performance) and a microphone has an output impedance. So if the microphone is 10,000 ohms and the amp circuit is 500 ohms then the transformer is designed to transform 10,000 ohms to 500 ohms for better signal transfer. If the trans former is on the output of an amplifier the trans former transforms the output impedance of the of the power amp circuit to the input impedance of the load. If the output is a speaker (usually 8 ohms ) and the output impedance of the amp circuit is 1000 ohms then for maximum power transfer the transformer trans forms 1000 ohms to 8 ohms. This was the case using electron tubes. Now with transistors, amplifier circuits can be built with lower output impedances (common collector circuit in a class B power amp) so the costly transformer can be eliminated. Also Audio transformers are made slightly different in design than power transformers. Ausio transformers are designed with higher resistance in the windings to enable a wider frequency response where as power transformers are designed with much lower resistance to keep heating minimized while passing only one power frequency (60 hertz) at large amounts of power. Roger nsc@psu.edu
What are the parameters of fet?
drain resistance (rd) amplification factor trans conductance
What is the miller effect in simple terms?
A: That becomes evident while the driving source i limited in current driving abilities the voltage increases the phenomenon occurs known as the miller effect. Once the threshold voltage is passed it begins to draw increasingly heavier drain current with respect to the gate. As the drain rises the trans conductance rises rapidly to saturation. concurrent with the rise in gain the once low feedback capacitance now swells to enormous proportions appearing as an additional to the input capacitance. cin=ciss+[1+av]cgd ciss= gate source in cap cgd=m gate drain capacitance av= voltage gain
Why is the transformer rated in KVA?
Because a transformer is only in use when it is under load. An actual power factor requires a load and it is neccessary if you are going to calculate for kilowatt.The Power equation isP = V I cos #Where cos # is power factorso its depend on load butVA or Volt-Amperes is the unit that is used to rate how much apparent power the transformer can produce before saturating. transformers can all come in different shapes and sizes and all vary from VA rating. a 1KVA transformer is the equivalent of a 1000VA transformer(very big). the 'K' in front of any unit means 1000 i.e 1k resistor is the same as a 1000Ω resistor.You might think it should be rated in kilowatts instead. KVA sound like they are algebraically identical to kilowatts.Not all electrical loads will have voltage multiplied by current, equal the power consumed by the load. That is only the case for simple resistive loads.Some electrical loads have the ability to store energy over the cycle, and cause the current and voltage to be "delayed" from one another. The total power, is therefore less than the product of the voltage and current that are supplied to the load.A transformer must be sized, so that each of its windings can handle a given operating voltage, and a maximum current, and still supply the intended loads. Due to a loads delaying of current and voltage, the current might be much greater than the value of real power divided by voltage. We need to size wire windings according to what the current will be. I.e. the kVA rating divided by voltage.A perfect transformer would have the same operating kVA on both sides of it, just with voltage traded for current differing between the windings.
Can a 5.7 hemi multi displacement block be used in a non multi displacement truck?
Yes with all accessories, mates to trans and change cpu
Does a 1999 firebird trans am have a voltage regulator?
it does but the ecm controls the amount of voltage.
What is the simplest way to convert capacitance to voltage?
If it is a variable cap, apply AC signal to the capacitor as per its specifications.This is done because the variation in the voltage gives a corresponding current output due to the charging and discharging of capacitor. Then a Trans-impedance amplifier can be used to convert this input current to voltage. Current amplifier can be used to amplify the current at the input of the trans-impedance amplifier. Similarly a voltage amplifier can be used at the out put of the trans-impedance amplifier to amplify the voltage output.
Where is the voltage regulator located in a 1978 Pontiac Trans Am?
Inside the rear of the alternator
What type of transmission fluids does 2002 dodge sprinter use?
A specific Sprinter trans fluid available from Dodge or Mercedes.A specific Sprinter trans fluid available from Dodge or Mercedes.
What does salts serve in cells?
Osmotic pressure. Trans-membrane voltage potential. Rapid signal propagation.
What is the base voltage in a transformer circuit?
depends on the type of trans former.buck or boost.primary winding a secondary winding
Which type of section separates the kneecap from the lower limb?
A coronal section separates the kneecap from the lower limb.
How to remove lower trans line from radiator?
Should be a threaded flared fitting
What is the voltage gain of the FET amplifier?
It can be answered in two ways : 1. ratio of output & input voltages [Vout / Vin] i.e Drain voltage(Vds)/Source voltage(Vs). 2. multiplication of trans-conductance & drain resistance .
What are the advantages to a lockup torque converter?
Lower trans temps and improved fuel economy.
Is the firebird and the Trans Am the same car?
They are the same car with different available options.
How many 95 trans am were made with the performance package?
the ws6 ram air performance package became available in April 1996 on the formula and trans am .
