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What is the difference between no load current and no load voltage?
Wiki User
∙ 12y ago
What does the question refer to? Induction motors? Transformers? For transformers, the no-load voltage is the voltage -- across the secondary or primary -- when there is no load attached to the secondary, that is, when there is no current in the secondary. No-load current really only makes sense when talking about a motor, because current is flowing in the device even when it's not under load. A rule of thumb is the no-load current is about a third to one half the full-load current.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoFirst of all, 'no load current' isn't a term normally used, as it simply means there is is no current flowing from the supply to the load because there is no load connected.
'No load voltage' however, is the value of voltage across a supply when there is no load connected to draw any current. All voltage sources have internal resistance and when a load current flows, it also flows through the voltage source itself, and an internal voltage drop is created across this internal resistance. This internal voltage drop acts in the opposite sense to the electromotive force of the source, and causes its terminal voltage to fall. The greater the load current, the greater the internal voltage drop, and the lower the terminal voltage. So, a 'no load voltage' is the voltage (equal to the electromotive force) appearing across the terminals of the supply when there is no load current to create an internal voltage drop, and is the maximum voltage that can appear across the terminals.
Wiki User
∙ 12y agoload current can be calculated from the formula of out put power =
I=P/sqr 3*V*cos &
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Phase difference between voltage and current at resonance?
The power factor is a measure of the phase difference. If they are exactly in phase the PF = 1. If they are 180 degrees out of phase PF = 0.
What is voltage regulation of synchronous generator?
The volatge regaulation be calculated by calculating the percentage difference between volatge at no load and voltage at full load
What is the difference between current coil and voltage coil?
These terms apply to the coils inside a wattmeter. 'Pressure coil' is an archaic term for 'voltage coil', which is connected in parallel with the supply, while the 'current coil' is connected in series with the load.
What is the power factor of an resititive load?
Power factor is the cosine of the phase angle between voltage and current. In a resistive load, current is in phase, i.e. with a phase angle of 0 degrees, with respect to voltage. Cosine (0) is 1.
What is the difference between voltage and emf?
E.M.F: Is the potential difference between two terminals when there is no current i.e. circuit is open, therefore [EMF = OCV].OCV :open circuit voltage.Voltage: Is the potential difference between two terminals when there is current i.e. closed loopAnswerAn e.m.f. (electromotive force) is a voltage or, more accurately, a potential difference ('voltage' is simply another word for 'potential difference'). However, it is the potential difference that appears across the terminals of a supply when it is not connected to its load. When the supply is connected to a load, this potential difference falls because of an internal voltage drop across the supply's internal resistance. So the simple answer is that an electromotive force is a supply's open-circuit terminal voltage.Another definition is obtained from Kirchhoff's Voltage Law, from which we can say that an electromotive force is equal to the sum of all the all the voltage drops around the circuit, including its internal voltage drops.
Difference between csi vsi and zsi?
vsi's output voltage is independent of load nature, but output current is depends on load nature. csi's output current is independent of load nature, but output voltage is depends on load nature.
What is the Difference between resistive and capacitive load?
when a resistive load is applied there is no phase angle difference between voltage and current. when a inductive load is applied there is phase difference between voltage and current. current lags voltage by an angle of 90 degrees for pure inductive load
Why peak voltage of the load is smaller than the voltage from the transformer output?
The voltage appearing across a load is always smaller than the no-load voltage of any voltage source -e.g. batteries, generators, or transformers. In simple terms this is because all these voltage sources have internal resistance or impedance which results in an internal voltage drop when the source delivers a load current. The resulting voltage, therefore, is always the difference between the no-load voltage and the internal voltage drop. A measure of the difference between a source's no-load and full-load voltage is termed its 'voltage regulation'.
Phase difference between voltage and current at resonance?
The power factor is a measure of the phase difference. If they are exactly in phase the PF = 1. If they are 180 degrees out of phase PF = 0.
In a purely resistive ac circuit the current and voltage?
Voltage and current will be in phase for a purely resistive load. As a load becomes more inductive or capacitive, the phase angle between voltage and current will increase.
What is line voltage and line current in star connection define?
In star the voltage from line to neutral is 1/sqrt(3) times the nominal voltage, while the load current equals the line current. In delta the voltage between lines is the nominal voltage, while the load current is 1/sqrt(3) times the line current (for a balanced load). So a delta load needs 3 times the resistance compared to a star load of the same power.
What is the relationsip between current and voltage?
Ohm's law says Voltage = Current x Resistance. As voltage increases, currrent increases proportionally with a fixed load.
What are the differences between emf and voltage drop?
emf and voltageAnswerElectromotive force is the potential difference created by a source, such as a battery or generator, when it is not connected to a load -in other words, on 'open circuit'.Voltage drop is the potential difference across a load, such as a resistor, which causes current to flow through that load.A voltage drop occurs, internally, in batteries and generators, when they are supplying a load. The battery or generator's terminal voltage, when supplying a load, is its e.m.f. less its internal voltage drop.
What is zero voltage regulation in transformers and what it means?
'Zero voltage regulation' indicates that there is no difference between its 'no-load voltage' and its 'full-load voltage' -this is only the case for an 'ideal' transformer.
What is voltage regulation of synchronous generator?
The volatge regaulation be calculated by calculating the percentage difference between volatge at no load and voltage at full load
What is the difference between current coil and voltage coil?
These terms apply to the coils inside a wattmeter. 'Pressure coil' is an archaic term for 'voltage coil', which is connected in parallel with the supply, while the 'current coil' is connected in series with the load.
Can terminal potential difference be greater than the emf supplied?
All cells have internal resistance. When connected to a load, the resulting load current results in an internal voltage drop across the internal resistance. This voltage drop acts in the opposite sense to the cell's e.m.f., thus causing its terminal voltage to fall below that of the e.m.f. The greater the load current, the greater the difference between the terminal voltage and the e.m.f.
