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Why do we use current sources as load in differential amplifiers?
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What is active load?
When it is required to increase the gain of a differential amplifier for that we have to increase the collector resistance to a large value which is difficult and also require larger chip area ,so instead we replace it by a constant current source that is a current mirror which is called an active load.
What is the percentage of the no-load current in a transformer to its full load current?
2 to 5% of full load current
The current load of a trnsformer is the current drawn by the?
Load!
What is the difference between no load current and no load voltage?
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.
What will happen when we change value of load resistance in transformer?
When the value of the load resistance in a transformer is changed, it will affect the current flowing through the circuit. Increasing the load resistance will decrease the current, while decreasing the load resistance will increase the current. This change in current will in turn affect the voltage across the load and the efficiency of the transformer.
What is an AF amplifier?
AF means audio frequency. Audio Amplifiers can be subgrouped as voltage amplifiers (or pre-amplifiers) and power amplifiers. The voltage amplifier will raise the level of level of the output of a microphone from say 1 mV to 500mV or 1V. The power amplifier will be the interface between this and the load, which is a speaker. The resistance of the speaker is often 4 ohm or 8 ohm. You cannot have a speaker with 1k as resistance! As such to get say 8W output, an amplifier providing 8V will have to pump 1 amp into an 8 ohm speaker. Thus power amplifiers will have to drive a lot of current into the load. Voltage amplifiers cannot do this. A power amplifier sometimes just has unity voltage gain, but has ability to drive a lot of current into the load. Typical power amplifiers are operated in class B, where for 50% of the signal swing, one transistor provides current, and for the other 50%, the other transistor in a class B provides current into load. Class B amplifiers have cross over distortion, But this can be overcome by pre-biasing, or making the stage operate as class AB. The power amplifiers can also be used to power low resistance loads such as a step up transformer.
What are different between sink current and souce current?
Perspective. They are one and the same, but from the perspective of a load and a generator, the load takes current (sinks it), and a generator generates it (sources it).
What is active load?
When it is required to increase the gain of a differential amplifier for that we have to increase the collector resistance to a large value which is difficult and also require larger chip area ,so instead we replace it by a constant current source that is a current mirror which is called an active load.
What are ideal current and voltage sources?
Sources without internal resistances.ideal voltage source has 0 ohms in series with it, no internal voltage drop all voltage delivered to loadideal current source has infinite ohms in parallel with it, no internal current loss all current delivered to load
How does load current varies with the load resistance?
Load current is related to load resistance by an inverse relationship. The load current increases linearly as load resistance decreases. Remember, the less resistance, the more current.
What is the percentage of the no-load current in a transformer to its full load current?
2 to 5% of full load current
The current load of a trnsformer is the current drawn by the?
Load!
The current load of a transformer is the current drawn by the?
load
Why the waveform of no load current is not sinusoidal?
No load current is mostly inductive, hence the load current may not be a sine wave
What is the difference between no load current and no load voltage?
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.
Why no load current is 5 percent of full load current in motor?
As the no load current is the current due to core losses of the motor which is very small .in no load terminals are open circuited no current flows through it, a small current flows which is due to core
Highly inductive load as a constant current source?
An inductor is a device that resists a change in current. The equation is di/dt = v/L. This means that inductors are current sources, and given a sufficiently large inductor, in comparision to the circuit, it is a constant current source.
