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What are the possible losses for a dc generator?
Friction in the bearings and in the commutator, and windage loss. Electrical resistance of the armature and field windings and the brushes.
Is Voltmeter is a moving iron Instrument or moving coil instrument?
If this is a homework related question, you really should consider trying to solve it yourself before looking at this answer. Otherwise, the value of the lesson, and the reinforcement provided by the assignment, will be lost to you.A moving coil measuring instrument has a coil attached to the indicator, surrounded by a magnet.A moving iron measuring instrument has a magnet attached to the indicator, surrounded by a coil.In both cases, the indicator is driven by magnetic torque caused by current flow in the coil.
Why no volt coil is made of thin wire in starter?
because of high voltageAnswer.The purpose of a no-volt coil is to cut off the power supply from the motor if the voltage supply drops to below a safe pre-determined value.So, alot of thin wires so that a strong magnetic flux is produced which will keep its armature attracted to the Iron point.
Why moving iron is used in both AC and DC current?
A moving iron instrument works by means of a coil that attracts a moving iron mass that is attached to a pivoted pointer which moves across a graduated scale. The iron mass will be attracted towards the coil, regardless of the magnetic polarity of the coil. So, as an AC current continually reverses the magnetic polarity of the coil, the iron mass is always attracted towards the coil, never repelled by it. Similarly, a moving iron instrument doesn't care in which direction a DC current is flowing. So the instrument works equally well with both AC and DC currents. Moving iron instruments, however, are not as accurate as moving coil instruments which, of course, are sensitive to the direction of current.
Specifically what are moving coil and moving iron used for measuring?
If you are questioning about different relay (contactor) constructions, the terms moving coil and moving iron designate what part of the relay moves and carries the conductor that makes or breaks a circuit.
What is an armature made of?
The armature is the part of an electric generator or motor that contains the main current-carrying winding. It usually consists of a coil of copper wire that is wound around an iron or steel core. The coil and core are placed in a magnetic field, which is produced by one or more permanent magnets or electromagnets.
Electricity is a form of energy transfer in which atoms lose and regain?
Electrons, that is why it is called electrical energy!! Ina battery one substance loses the electrons and the other substance gains electrons. No one substance loses and gains electrons. When anode substance has lost too many electrons to the cathode, we say the battery is discharged. In the case of an electric generator, the electrons are forced to move thru a coil of wire as it spins in a magnetic field. In the picture below an outside force such as steam pressure makes the coil of wire spin causing the electrons in wire to move. The electrons move thru the coil of wire, thru a resistance like a bulb and back to the coil of wire. It is called a complete circuit. In this case, no electrons were lost or gained. A generator is a motor backwards. In a motor, the electric energy produces a magnetic field in the armature, which produces a North and South pole in the iron core of the armature, which causes the north pole of the armature to be attracted to the south pole of the magnet. In a generator, an outside force such as steam pressure turns the magnets around the armature, causing the electrons on the wire to move. In this case, however as the magnet is spun, it produces a like pole on the armature. In other words, as you turn the North pole of the magnet towards the armature, it produces a north pole in the armature. That is why energy is required to turn the armature. If you could turn the magnet and it produced an opposite pole on the armature, the armature would be attracted to that pole and spin with no more outside force needed. You would have a perpetual motion machine.
What are the possible losses for a dc generator?
Friction in the bearings and in the commutator, and windage loss. Electrical resistance of the armature and field windings and the brushes.
What is the iron bar in a relay called?
The armature.
Explain the working principle of shunt generator?
A shunt generator is a machine with a rotating set of coils of wire embedded in the iron core in its armature (the spinning part), and a 'commutator' and brushes that carry the current from the (spinning) windings on the armature to the stationary external electrical load. It also has a 'field' winding that creates a stationary magnetic field inside the machine, that the armature coils are spun in. As the windings spin, they cut the stationary field and generate an alternating voltage. As well as providing a moving connection to the coils, the commutator and brushes act like a switch, reversing the connections from the coils to the external circuit each time the waveform changes polarity from positive to negative and vice versa. This creates direct current in the external circuit and load. In a shunt generator, the field windings are connected in parallel with the armature ('shunt' is a common term for 'in parallel') and the field gets its power ('excitation') from the armature - the machine is 'self-excited'. A self-excited generator needs a small 'residual field' in the field's iron core so it can generate a small output from the armature when starting, which is fed to the field, boosting the armature output, which is fed to the field.... and so on, until the field iron core saturates with flux, and the field stops strengthening. Shunt generators are the 'workhorse of the small generator market - they are cheap and simple, have an output voltage that 'droops' a little with increasing load, and most shunt generators can safely be short-circuited - this takes the electrical energy away from the field, and the armature can usually develop only a small output current - not enough to damage it.
The movable iron bar in a relay?
It is called an armature.
What is the moveable iron bar in a relay called?
The armature.
Why is soft iron used in electric bell?
Soft iron is used as the metallic substance which gets attracted to the electromagnet and a hammer is attached to the armature which strikes the gong when the armature is attracted.
Why is an armature made of iron?
so the electro magnet can attract it as it will be magnetic
what is changed by flipping the direction of the electrons, which is controlled by the commutator?
Changes the poles of the magnet
What consists of a coil with an iron core and a movable iron bar?
A solenoid consists of a coil with an iron core and a movable iron bar. The term was coined by French physicist, Andre-Marie Ampere.
Is Voltmeter is a moving iron Instrument or moving coil instrument?
If this is a homework related question, you really should consider trying to solve it yourself before looking at this answer. Otherwise, the value of the lesson, and the reinforcement provided by the assignment, will be lost to you.A moving coil measuring instrument has a coil attached to the indicator, surrounded by a magnet.A moving iron measuring instrument has a magnet attached to the indicator, surrounded by a coil.In both cases, the indicator is driven by magnetic torque caused by current flow in the coil.
