Purely inductance is when an inductor is provided with an alternating current (AC) or alternating voltage (AV) from an external source, it acts to oppose the change in current through it. This opposition to the change in current is called inductive reactance, and can be represented as the formula X_L=2*π*f*L, where L is the inductance of the inductor (in Henrys) and f is the frequency of the AC source.
Purely inductive components (inductors) have no opposition to DC currents but will have a substantial resistance to AC currents and/or voltages. Generally, the greater the value of the inductor (L), the higher the inductive reactance and the greater the opposition to the AC currents/voltages.
What do you mean by purely inductive and purely capacitive load?
Purely inductive and purely capacitive loads refer to electrical circuits that only contain either inductive or capacitive elements. An inductive load consists of inductors and resistors, while a capacitive load is made up of capacitors and resistors.
In a purely inductive load, the current leads the voltage, while in a purely capacitive load, the voltage leads the current. In both cases, the power factor is low. With inductive loads, the current is typically inversely proportional to the voltage, while with capacitive loads, the current is directly proportional to the voltage.
These two types of loads have different characteristics when connected to a motor or generator and can have a significant effect on power system design. For example, a purely capacitive load will reduce the power factor of the system, while a purely inductive load will increase the power factor.
They both have an effect on the voltage stability and frequency of the system, as well as having a varying effect on motor heating.
Why pure inductor is not possible?
A pure inductor is not possible because the ideal inductor would have no resistance or dissipative losses. In the real world, all inductors have some resistance in them due to the fixed imperfections that limit the ability of a conductor to carry electric current.
As current passes through these imperfections, some of the energy is lost as heat. This resistance is known as winding resistance and is part of the total loss associated with the inductance of the inductor.
Additionally, the properties of inductance and resistance both can change with temperature and other external factors, making it virtually impossible to achieve the perfect conditions for an ideal inductor.
What are the 3 types of inductors?
The three main types of inductors are air core, ferromagnetic core, and adjustable core. Air core inductors are the most basic type, which consist of simple coils of wire and often provide low-value inductance.
Ferromagnetic core inductors have coils of wire wrapped around a material such as iron or ferrite and are used to increase the inductance of the inductor. Adjustable core inductors are those that use a variable core material, such as a ferrofluid, which can be adjusted to achieve the desired inductance of the inductor.
When inductance is zero?
Inductance is usually only zero when a component or circuit is not capable of storing energy as a magnetic field or when a coil or other component of a circuit doesn’t pass any current through it. In most cases, inductance is non-zero, and is measured in Henries in circuits.
Generally speaking, if a coil or component has a large physical size and a large number of turns, it will have a relatively high inductance, whereas a coil or component with a small physical size and fewer turns has a lower inductance.
Therefore, in order for inductance to be zero, it must either be a component or circuit that isn’t capable of storing energy as a magnetic field, or a component through which current does not pass.
Why do inductors oppose current?
An inductor is a type of electrical component that is designed to oppose changes in current flow. This opposition is due to the property of inductance, which is a physical property of electrical circuits that causes an inductor to create a voltage when the current flowing through it changes.
Inductors resist changes in current because as the current is increasing, a magnetic field is created in the inductor that has a force that opposes its growth. Similarly, as the current is decreasing, the magnetic field collapses, creating its own opposing force.
This opposition of current is known as back-emf or counter electromotive force. Inductance plays a very important role in many electrical circuits, as it gives them the ability to filter currents, regulate voltage, and store energy.
Why is inductance called L?
Inductance is called L because of the historical use of an uppercase letter “L” (the Roman numeral for fifty) to shorthand the term “inductance. ” When scientists and engineers began exploring electric and magnetic fields in the 1800s, inductance became an important concept in the study of electromagnetism.
Since the Roman numeral for fifty had a similar sound to “inductance,” the symbol was adopted to denote the concept. With time, the symbol took on a fuller meaning and is now synonymous with inductance.
Is there a perfect inductor?
No, there is no such thing as a perfect inductor. All inductors have an unavoidable degree of losses, and no inductor is completely immune to the effects of temperature, electrical noise, and other factors.
The losses, or resistance, of an inductor are typically measured in ohms, and the amount of loss depends on the type and quality of the inductor. The two main types of losses in an inductor are series losses and parallel losses.
Series losses refer to the resistance of the inductor due to the connected wires it contains, while parallel losses refer to the resistance of the core of the inductor itself. Temperature changes and current passing through the inductor can affect both types of losses, so there is no one “perfect” inductor that can withstand all these factors.
Why is inductance not possible without resistance?
Inductance is related to the magnetic field created around a wire whenever an electric current is passed through it. In order for this to take place, electric current must be able to flow through the wire and the varying current must be able to continuously build and collapse the magnetic field.
Without an opposing force, this magnetic field will build indefinitely which is why resistance is necessary to limit the current and therefore limit the magnetic field. Without resistance, excessive current would flow through the coil, which would create an immense magnetic field and could cause damage to the coil and any associated components.
Resistance acts as a protective component in this case and therefore is necessary for inducing inductance.
How do you know if a circuit is inductive or capacitive or purely resistive?
You can determine if a circuit is inductive, capacitive, or purely resistive by measuring its electrical properties. An inductive circuit has inherent inductance, which is the result of an electric current flowing through a set of loops of wire or material that changes resistance as the current changes.
This results in an increase or decrease to the current flow in the circuit, and also a change in the frequency of the current. A capacitive circuit also has inherent capacitance, which is the result of electrical energy being stored between two or more electrodes and can be released suddenly.
When measuring a circuit you can measure the ‘reactance’ which will give you an indication of the type of circuit. A purely resistive circuit will show a low or nearly zero reactance. If a circuit’s reactance is positive then it is an inductive circuit, and if it is negative it is a capacitive circuit.
What is difference between resistance and resistive?
Resistance and resistive are two words that are often used interchangeably, but they refer to different concepts. Resistance is a physical property that describes the opposition to an electric current flow.
It is generally associated with electrical components such as resistors, wires, and diodes. On the other hand, resistive is a type of electrical behavior that is characterized by an opposition to electric current.
Resistive behavior is commonly observed with materials such as rubber and insulation, while electrical components such as resistors display a high level of resistance. In essence, resistance is a term related to electrical properties, while resistive is a behavior related to electric current.
What are 3 examples of resistance in an electrical circuit?
1. Resistance in an electrical circuit is related to the amount of current flowing through the circuit. Common examples of resistance include the resistance of a wire, the resistance of a light bulb, and the resistance of a resistor.
2. Resistance of a wire is usually given in Ohms (Ω). It is primarily determined by the diameter and length of the wire. Long wires, or wires of small diameter, will generally have higher resistance than shorter wires of large diameter.
3. Resistance of a light bulb is determined by the type and wattage of the bulb. Low wattage bulbs such as a 25 watt bulb may have a resistance of around 8 ohms, while high wattage bulbs such as a 100 Watt bulb may have a resistance of about 12 ohms.
4. Resistance of a resistor is determined by its size and resistance value as indicated by its color code bands. Different types of resistors, such as carbon film resistors or metal oxide film resistors, can also have different resistance values.
Are LED lights inductive or resistive?
LED lights are typically considered a resistive load, which means that the electrical resistance of the system does not change when current is applied. This is in contrast to inductive loads, which change in resistance when current is applied.
LEDs operate mainly based on the resistance of the silicon and metal layers in the diode, and their current will remain constant as long as the voltage applied remains the same. LEDs generally don’t create a current surge, as they do not have a large inductance component compared to most other lights — these surges can damage electrical circuits.
This is why LEDs are seen as a more reliable lighting source that is capable of providing greater efficiency than traditional lights.
What is resistive power also known as?
Resistive power is also known as reactive power and is the power associated with reactive elements in an electrical circuit, such as capacitors and inductors. The reactive elements can store energy in the form of electric and magnetic fields, and the resistive power is a measure of the rate at which these elements can transfer the stored energy back into the circuit.
Resistive power is measured in units of volt-amperes reactive (VARs). It is also referred to as “wattless power,” “magnetizing power,” or “reactive power,” and is given the symbol ‘Q’. Resistive power is important for engineering applications, as it affects the power factor of an electrical system.
The power factor indicates how well the electrical system is utilizing its power, in terms of the ratio of active power (P) to total power (P+Q). A higher power factor means less resistive power is being consumed and more power is being used in useful electrical work.
Is a battery charger inductive or resistive?
A battery charger can be either inductive or resistive, depending on the type of charger. Inductive chargers use an alternating current (AC) power source to create a magnetic field that induces current into the battery.
Inductive chargers often use AC to DC power inverters to step down the AC power to an appropriate level for the battery. Resistive chargers, on the other hand, use a direct current (DC) power source to charge the battery, passing electricity directly from the charger to the battery.
Some chargers have both inductive and resistive charging stages, where they start out with an inductive charging stage and then switch over to a resistive charging stage as the battery nears full capacity.
In any case, it is important to make sure that the type of charger you are using is compatible with the type of battery you are charging.