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Generally, devices designed for use on an AC circuit cannot be supplied from a DC supply. The reason is that whereas DC loads are simple resistances, so current is calculated by volts divided by resistance in ohms, AC devices have their current limited by inductive and/or capacitive effects as well as resistance.
A simple example is an 24 VAC relay. Supplying this relay from 24 VDC would cause it to burn out rapidly.
Purely resistive load
An example of this is an electric fire or water heater.
Very simply, an electric element normally running on 230VAC would behave in exactly the same way if connected to 230VDC. This is not a coincidence, it is engineered!
230VAC is actually 230 VAC in RMS terms. (root mean squared). What this simply means is that the DC Equivalent Voltage is quoted, i.e. what DC level would produce the same heating effect. The actual AC voltage is 2.828 times this. You need an oscilloscope to show that this is true. Multimeters will normally show the AC RMS value.
So, to sum up, purely resistive loads will react the same way to AC and DC voltage, as long as the AC voltage is quoted as the RMS figure (this is normal).
For other loads, applying DC to an AC load will usually cause it to burn out, and applying AC to a DC load will usually result in it not working as the current is too low.
by using oscilloscope
AnswerOne ampere of direct current does exactly the same amount of work as one ampere of alternating current. So 1 A (DC) is exactly equal to 1 A (AC). However, what you must remember is that 1 A (AC) is its effective or root-mean-square value, and it actually peaks (i.e. its amplitude) to 1.414 A if it is a sine wave.
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Why dc output voltage of a bridge rectifier varies with the load current?
aA A: the output of a Bridger's rectifier will always follows proportionally to the load since it does not regulate the output it merely transform AC TO DC '
What is the Working of online ups?
Online UPS on the other hand uses an Inverter which always on to give sine wave AC in the output socket. The incoming AC is first converted into DC by a transformer to charge the battery as well as to give power to the inverter transformer. The inverter transformer converts the DC to AC continuously to power the load. If power fails, the battery backup circuit switches on and takes the load. Online UPS is more efficient than the Offline UPS and uses a "Constant duty Inverter". It also has a "Static bypass" system that transfers the load to the AC power if the inverter system fails. The advantage of the Online UPS is that, it clean up the AC waveform by converting it into DC then reconverting this DC to fresh AC.
What is the output voltage of megger is it ac or DC?
megger are available in ac &dc
What is the difference while applying kcl to dc and ac circuits?
KCL is Common to both AC and DC. Only the waveform or AC and DC will differ
What is an ac voltmeter?
A: It is a regular DC voltmeter but the AC is rectified and the DC component is measured and displayed as AC VOLTS.
How do you calculate primary AC for 3 phase ac input if output load dc current is known?
DC Current divided by 1.225
Difference between dc load line and ac load line?
well the difference mainly exists in the method of finding them , these are :-1. in finding DC load line :-open all AC sourcesopen all the capacitors2. for AC load line:-open all the Dc sourcesshort all the capacitors.
Ac and dc load line of BJT-explain?
when the dc supply given, dc load line lies in the Ic and Vcc. when the AC supply given, AC load line lies in the Ic and Vcc.
What is difference between AC and DC load line?
A dc load line is formed by joining the 2 points wherin the slope is equal to the inverse of the load resistance.. whereas the ac load lin has a different slope... and it intersects the dc load line at the quiescent point.
What are the similarities in AC and DC?
Both AC and DC are current methods in which electrons move along a wire
Ac voltage applied across a load resistance produce alternating current?
The reason an AC voltage applied across a load resistance produces alternating current is because when you have AC voltage you have to have AC current. If DC voltage is applied, DC current is produced.
What are Ac load lines in an amplifier and how they are drawn?
The dc load resistance is Rc but the AC Load resistance is (RcRl). If a load line is drawn the slope of which is -1(Rc Rl) . Then it is called an AC load line and it is to be used when the transistor is operating as an amplifier.
How do you calculate the ac amps when you have the DC volts DC amps and the ac volts?
the answer is dc volts are rectified from ac volts and the amperage will be the same unless you account for the slight drop from the rectifier. dc volts from a battery have no relationship to ac volts. you can derive ac volts from a dc source using an inverter.
Will a 10 amp dc to ac inverter handle a 12v 50 amp battery for dc input?
depends on your load...
Why does AC load differ from DC load?
The terms a.c. and d.c. stand for alternating current and direct current, respectively.
What type of ac motor will operate at a constant speed from no load to full load?
The Synchronous motors will operate at a constant speed from noload to fullload. Even it is classified as an AC motor, we have to fed the motor both AC and DC supplies. That we have to supply DC to the Field (Normally Rotor) and AC to the Armature (Normally Stator).
When you stepup ac voltage the current drops.What will happen with CURRENT if DC is stepped up?
WHEN YOU STEP UP THE VOLTAGE AND THE LOAD IS THE SAME MORE CURRENT WILL FLOW NOT LESS. AND THAT WILL HOLD TRUE FOR DC AS WELL. IF THE LOAD REMAINS THE SAME AND YOU INCREASE THE CURRENT AC OR DC THE VOLTAGE WILL INCREASE
