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Constant current generation of linear sweep voltage using op-amp?
Wiki User
∙ 10y ago
When using the Op-amp we get constant current generation of the linear sweep voltage.
Wiki User
∙ 10y ago
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Why the magnetization current is not sinusoidal even though the input voltage is sinusoidal?
In ferromagnetic materials,such as electrical steel,the magnetisation curve is not a straight line,or else the relation B=μH is not linear ( μ is not constant),H is linear function of magnetization current,while B is linear function of input voltage ,so we have : Im=f(μ)U,where f(μ) is not constant,Im=magnetization (magnetizing) current, U=input voltage. I hope this will help.
When is Ohm's Law not true?
Hardly ever.Ohm's Law is not an universal law, and is only true when the ratio of voltage to current is constant over a wide range of voltages and, then, only for that range of voltages. In other words, if the voltage to current ratio results in a straight-line graph. If the graph is curved, then the ratio of voltage to current is not constant, and Ohm's Law doesn't apply.So Ohm's Law only applies to metal conductors, for example, providing their temperatures remain constant for changes in current -a situation that usually doesn't occur in real life. And it most certainly doesn't apply to the non-linear parts of the voltage/current characteristic curves for diodes, etc.
What happens to electric current as voltage gets large?
If the resistance of the load is kept more-or-less constant, then the current also becomes larger. On the other hand, if the power of the load is kept more-or-less constant, then the current becomes smaller.
Does ohns law state that the current equals amperes divided by the restitance?
No, it doesn't! Ohm's Law states that 'the current passing through a conductor is proportional to the voltage applied across the ends of that conductor, providing external conditions such as temperature remain constant'. Put another way, Ohm's Law can be expressed as 'the ratio of voltage to current is constant for variations in voltage'.In fact, very few conductors obey Ohm's Law, so that it is by no means a universal law. Those that do are called 'linear' or 'ohmic' materials, whereas those that don't are called 'non-linear' or 'non-ohmic'. Non-linear conductors include tungsten, and non-linear devices include semiconducting materials including diodes.The ratio of voltage to current is called resistance, so you can always determine the resistance of a material, at any given voltage, by dividing that voltage by the current -whether that material obeys Ohm's Law or not.
What are the basic principles of ohms law?
Not all circuits obey Ohm's Law; in fact, most don't!Ohm's Law is a law of constant proportionality, and states that 'the current flowing through a conductor is directly-proportional to the potential difference across the ends of that conductor providing physical conditions, such as temperature, remain constant'. Expressed another way, the ratio of voltage to current must be a constant for variations in voltage, for Ohm's Law to apply.Ohm's Law only applies to linear ('ohmic') materials which includes metals, providing their temperatures are constant. Electrolytes, gases, semiconductors, however are non-linear ('non-ohmic'), and Ohm's Law doesn't apply to these.The ratio of voltage to current is resistance, and this applies to all circuits, whether linear or non-linear. But it only tells us what the resistance happens to be at that particular ratio. But for Ohm's Law to apply, the resistance must remain constant for changes in voltage. Put simply, if the resistance of a circuit changes when the applied voltage varies, then it is not obeying Ohm's Law.
Does voltage versus current indicate a linear relationship?
Yes, provided the resistance is constant. If the resistance varies with current, then you have a non-linear circuit
Why the magnetization current is not sinusoidal even though the input voltage is sinusoidal?
In ferromagnetic materials,such as electrical steel,the magnetisation curve is not a straight line,or else the relation B=μH is not linear ( μ is not constant),H is linear function of magnetization current,while B is linear function of input voltage ,so we have : Im=f(μ)U,where f(μ) is not constant,Im=magnetization (magnetizing) current, U=input voltage. I hope this will help.
What is the relation of current voltage resistance to one another?
Under normal circumstances, the relationship is given by Ohm's lawvoltage = current x resistance.The ratio of voltage to current is called resistance. This is obtained from the definition of the ohm, and not (as so often stated) from Ohm's Law.If the ratio of voltage to current is constant for variations in voltage, then the load obeys Ohm's Law and is called a 'linear' or 'ohmic' load.If the ratio of voltage to current changes for variations in voltage, then the load does NOT obey Ohm's Law, and is called 'non-linear' or 'non-ohmic'. Pure metal conductors ONLY obey Ohm's Law if their temperature is held constant. No semiconductor obeys Ohm's Law.
Why is the graph of the non-ohmic conductor is curved in nature?
Ohmic (or 'linear') materials obey Ohm's Law. That is, their ratio of voltage to current remains constant for variations in voltage. Ohmic materials, therefore, produce a straight line graph when we plot current against variations in voltage;Non-ohmic (or 'non-linear') materials do not obey Ohm's Law. That is, their ratio of voltage to current variesfor variations in voltage. This means that non-ohmic materials produce a curved line graph when we plot current against variations in voltage.
When is Ohm's Law not true?
Hardly ever.Ohm's Law is not an universal law, and is only true when the ratio of voltage to current is constant over a wide range of voltages and, then, only for that range of voltages. In other words, if the voltage to current ratio results in a straight-line graph. If the graph is curved, then the ratio of voltage to current is not constant, and Ohm's Law doesn't apply.So Ohm's Law only applies to metal conductors, for example, providing their temperatures remain constant for changes in current -a situation that usually doesn't occur in real life. And it most certainly doesn't apply to the non-linear parts of the voltage/current characteristic curves for diodes, etc.
Is inductor linear or non linear when the initial in it is non zero taking output as current and input as voltage?
Linear
What happens to electric current as voltage gets large?
If the resistance of the load is kept more-or-less constant, then the current also becomes larger. On the other hand, if the power of the load is kept more-or-less constant, then the current becomes smaller.
When voltage increases what happens to current?
Ohm's law states that "The current is directly proportional to the applied EMF (voltage) and inversely proportional to the resistance in the circuit."AnswerIf the voltage across a circuit increases, then the current will increase too. If the ratio of voltage to current is constant for variations in voltage, then the circuit is described as being 'linear' and is obeying Ohm's Law; if the ratio of voltage to current changes (as it would, for example, with tungsten) for variations in voltage, then the circuit is described as being 'non-linear', and is not obeying Ohm's Law. This is because Ohm's Law is not universal, and only applies to certain materials; in fact, most materials and electronic devices do not obey Ohm's Law.
Does ohns law state that the current equals amperes divided by the restitance?
No, it doesn't! Ohm's Law states that 'the current passing through a conductor is proportional to the voltage applied across the ends of that conductor, providing external conditions such as temperature remain constant'. Put another way, Ohm's Law can be expressed as 'the ratio of voltage to current is constant for variations in voltage'.In fact, very few conductors obey Ohm's Law, so that it is by no means a universal law. Those that do are called 'linear' or 'ohmic' materials, whereas those that don't are called 'non-linear' or 'non-ohmic'. Non-linear conductors include tungsten, and non-linear devices include semiconducting materials including diodes.The ratio of voltage to current is called resistance, so you can always determine the resistance of a material, at any given voltage, by dividing that voltage by the current -whether that material obeys Ohm's Law or not.
What are the basic principles of ohms law?
Not all circuits obey Ohm's Law; in fact, most don't!Ohm's Law is a law of constant proportionality, and states that 'the current flowing through a conductor is directly-proportional to the potential difference across the ends of that conductor providing physical conditions, such as temperature, remain constant'. Expressed another way, the ratio of voltage to current must be a constant for variations in voltage, for Ohm's Law to apply.Ohm's Law only applies to linear ('ohmic') materials which includes metals, providing their temperatures are constant. Electrolytes, gases, semiconductors, however are non-linear ('non-ohmic'), and Ohm's Law doesn't apply to these.The ratio of voltage to current is resistance, and this applies to all circuits, whether linear or non-linear. But it only tells us what the resistance happens to be at that particular ratio. But for Ohm's Law to apply, the resistance must remain constant for changes in voltage. Put simply, if the resistance of a circuit changes when the applied voltage varies, then it is not obeying Ohm's Law.
According to ohm's law resistance is equal to voltage divided by?
The equation you are looking for, R = E/I, is derived from the definition of the ohm, not from Ohm's Law. Ohm's Law is properly-called 'Ohm's Law of Constant Proportionality', which states that, for certain (linear) loads, the ratio of voltage to current is constant for changes in voltage. The above equation applies whether Ohm's Law does or does not.
Why does a ac voltage applied across a load resistance produce alternating current in the circuit?
Because V = I x R or Voltage = Current x Resistance. Since resistance is linear there is a linear relationship between Current and voltage. If you have DC voltage you have DC current and if you have AC Voltage you have AC current. Note that there is a linguistic recognition of this relationship in that the voltage is described in terms of the current.
