There is pure resistance, inductive reactance, and capacitive reactance.
Power
I'll give you three kinds: Direct current, alternating current, and static.
M L T are the units. M represents Mass, L represents Length and T represents Time. These are the fundamental units and all other units are derived from these three. Example: Velocity is MLT-1
protons,neutrons and electrons
The model is similar to the real object because of how it is three-dimensional.
If all three bulbs are in parallel, then there are three current pathways.
I think it's only two types. Resistance, the real part of impedance, and reactance,the imaginary part. All possible values of impedance can be made from suitable amountsof each of these.If you absolutely must have three types, then you'll be relieved to hear that reactancecan be positive (inductive, voltage leading) or negative (capacitive, voltage lagging).
Ohms Law says that Voltage = Current * Ohms, so the twothings that can affect the voltage in a circuit are Current and Ohms. If have a non resistive impedance, i.e. a capacitor or inductor forming a reactance, then frequency can also affect the voltage but, mathematicaly, reactance is a frequency domain form of impedance, so my answer stands - Current and Ohms.
It's applicable anytime you have a combination of any three: charge, voltage, current, power, or impedance.
Voltage, frequency, current, impedance, and what the circuit is supposed to do are all important.
In symmetrical components, there are three types of impedances - positive sequence (balanced), negative sequence (unbalanced), and zero sequence (ground). In a transformer, positive and negative are equal. Ground impedance is determined by the (same factors as the) positive sequence and is based on the flux paths available through the transformer core that can induce ground current.
The resistance and reactance of an a.c. load are determined from the phasor diagram for that load. A phasor diagram is very similar to vector diagram, and represents the voltage drop across the resistive component of the load as being in phase with the load current, and the voltage drop across the reactive component as lagging the load current by 90 degrees. The vector sum of these two voltage drops will equal the value and phase-relationship of the supply voltage.If we now divide each of these three voltages by the supply current, we will converted the phasor diagram into what is called an 'impedance triangle', in which the resistance is represented horizontally, the reactance is represented vertically, and the impedance is represented by the resulting hypotenuse. So, to find the hypotenuse (i.e. the impedance) we must use Pythagoras's Theorem to vectorially-add the horizontal (resistance) and vertical (reactance) components.
Just like a line reactor.. A 3-phase Line Reactor is a set of three (3) coils (also known as windings, chokes or inductors) in one assembly. It is a series device, which means it is connected in the supply line such that all line current flows through the reactor, as shown below. Line Reactors are current-limiting devices and oppose rapid changes in current because of their impedance. They hold down any spikes of current and limit any peak currents. This resistance to change is measured in ohms as the Line Reactor's AC impedance (XL) and is calculated as follows: XL = 2 π f L (ohms), where: f = frequency in hertz (cycles per second) harmonic frequency examples: harmonic (60 Hz)frequency (Hz)5th3007th42011th660 L = reactor inductance in henries (H), millihenries (mH) -- H x 10-3, microhenries (µH) -- H x 10-6 By inspection of the XL formula, the Line Reactor is directly proportional to the frequency (f) and the inductance (L). That is, if the impedance of a Line Reactor is 10 ohms at 60 Hz, then at the 5th harmonic (300 Hz) the impedance is 50 ohms. If the inductance (L) is increased, then the impedance will increase proportionally. This increase in Line Reactor impedance will reduce the current in the line. The higher the frequency (Hertz), the lower the current. A Line Reactor's DC resistance (R-ohms) is very low by design so that the power losses (watts-I2R) are low. Line Reactors are rated by % impedance, voltage and current. However, they are sized by % impedance, voltage and motor horsepower. The motor horsepower determines the necessary current rating for the Line Reactor. Line Reactors are rated by impedance, voltage and current. # Impedance (% impedance of load Z) The load impedance (Z) is calculated by this formula: Z = V/I, where Z = load impedance (ohms), V = line voltage (volts), and I = line current (amps) This percent of load impedance also determines the voltage drop across the Line Reactor. For example, a 5% Line Reactor would have a 5% voltage drop. # Voltage rating Since a Line Reactor is a current-sensitive device, the voltage rating is needed for dielectric concerns as a maximum voltage and horsepower. It is also used to determine the current rating when given only voltage and horsepower. # Current rating (amperes) This is the current required by the load(s). It is total current flowing to the load(s) and through the reactor. This current is measured in amperes (amps).
The three electrical quantities are current voltage and resistance. Current is measured in amperes (A) and is the rate at which electricity flows through a conductor. Voltage is measured in volts (V) and is the electrical force pushing the current through the conductor. Resistance is measured in ohms () and is the opposition to the flow of current. Current - measured in amperes (A) Voltage - measured in volts (V) Resistance - measured in ohms ()
When the system is in balance, with three equal phase currents, there is no current in the neutral 4th wire and it is not needed. However if the load is unbalanced, the neutral is needed to maintain the star point at zero volts.So for example a street of houses fed by a 3-phase supply needs a neutral because the houses draw unequal currents from the different phase lines, although a large enough collection of houses would tend to balance itself out.If a three-pase system has equal currents the current in the neutral is zero. If two phases draw equal current but the third has no load, there is an equal current in the neutral, and if one phase draws current but the other two have no load, there is again an equal current in the neutral.ANOTHER ANSWERA three-phase, four-wire, system comprises three line conductors and a neutral conductor. If the load supplied by this system is balanced (i.e. the loads connected between each line and neutral are identical in all respects), then no current will flow in the neutral conductor regardless of its impedance. If the load is unbalanced, then a neutral current will flow in the neutral conductor. In other words, the impedance of the neutral conductor plays no part in whether or not there is a neutral current.
It is conducting OC and SC tests on the given three phase alternator and determining the regulation by synchronous impedance method.
a three golden leafed clover represents the three goldde apples
I = q / twhere I represents the currentand q represents the chargeand t represents the time.I = V/Rwhere I represents the currentand V represents the voltageand R represents the resistance