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In DC motor is the armature plus brushes resistance substantially the same for every rotational position of the armature why?
In a DC motor, the armature resistance and brush contact resistance remain relatively constant across different rotational positions because these components are primarily resistive and do not change with position. The brushes continuously maintain contact with the commutator segments as the armature rotates, ensuring a consistent electrical path. While the inductance and back EMF may vary with position, the resistance itself is a fixed characteristic determined by the materials and design of the armature and brushes. Therefore, the overall resistance remains substantially the same throughout the armature's rotation.
What is the unit used of resistor?
The ohm. It is how much resistance a component or part of a circuit has to the flow of electrical charge when a voltage is induced across it.
What diodes are called catching diodes?
It's a diode that is used to limit a voltage to some desired value. Importantly, it's used to limit a transient voltage or an alternative voltage. The simplest example is that diode placed across a relay's inductive coil. As current is cut off through the coil, a large induced voltage appears that can cause damage to the circuit. A diode can be placed in circuit to catch/damp the induced voltage.
How is an alternating current produced?
EMF is induced in a coil when it is rotated in magnetic field. The magnetic field is obtained in the space between N Pole and S Pole of a magnet. coil is kept on shaft and it is rotated. To take out the current from the coil, two slip rings made of brass are kept on the shaft. The slip rings are insulated from each other and from the shaft. Carbon brushes are placed on the slip ring. EMF is available across these brushes. Load is connected across the brushes. This is called single phase type alternator or AC Generator. In practice three phase type alternator is used. In alternator, used in power stations, armature is kept stationary and field is rotated.
What is the difference between a DC motor and a generator in terms of EMF?
During the operation of a DC motor, EMF is created across its terminals using an external source. Whereas, in a DC generator EMF is created across its terminal based on principle of dynamically induced EMF. So talking in terms of EMF, in DC motor EMF is consumed by the motor coil and utilized to rotate the axle. On the other hand, in DC generator EMF developed across coil is transfered to a load or a battery and consumed by them.
In DC motor is the armature plus brushes resistance substantially the same for every rotational position of the armature why?
In a DC motor, the armature resistance and brush contact resistance remain relatively constant across different rotational positions because these components are primarily resistive and do not change with position. The brushes continuously maintain contact with the commutator segments as the armature rotates, ensuring a consistent electrical path. While the inductance and back EMF may vary with position, the resistance itself is a fixed characteristic determined by the materials and design of the armature and brushes. Therefore, the overall resistance remains substantially the same throughout the armature's rotation.
How do By- The-Wind-Sailors get their food?
They have a hole on the bottom of them that sucks up the food that brushes across the bottom of their body...
What are the benefits of using Bare Minerals brushes?
Bare Minerals brushes apply makeup smoothly, providing full coverage, but not in excess. Made of goats hair, the brushes are soft and the bristles do not shed. They pick up pigment well and spread it across the skin nicely.
How does an induced voltage across a generator coil change during each revolution of the magnet?
sinusoidally
How would you define symmetry?
Identical construction across a boundary, e.g. a line. There is also rotational symmetry.
If you connected the test leads of an ohmmeter to the brushes of a DC electric motor what reading would you read?
If you connect the test leads to the brushes of a DC electric motor, you would typically measure the resistance across the armature circuit. This reading can help you determine the condition of the armature winding, the brushes, and the connections.
When a skater glides across the ice on one skate what kind of motion does the skater have?
The skater would exhibit rotational motion as well as translational motion during the glide. Rotational motion is the spinning of the skater around their own axis, while translational motion is their movement across the ice in one direction.
How does swept back wing reduce induced drag?
A swept back wing reduces induced drag by allowing the wing to better distribute lift across its span. This helps to minimize the formation of turbulent wingtip vortices which contribute to induced drag. Additionally, the sweep angle reduces the effective angle of attack at the wingtips, which further reduces induced drag.
What figure has rotational symmetry but not line symmetry?
A figure that has rotational symmetry but not line symmetry is a figure that can be rotated by a certain angle and still look the same, but cannot be reflected across a line to create a mirror image of itself. An example of such a figure is a regular pentagon, which has rotational symmetry of 72 degrees but does not have any lines of symmetry. This means that if you rotate a regular pentagon by 72 degrees, it will look the same, but you cannot reflect it across any line to create a mirror image.
What is the name of the movie where the guys friends bet that he cant go without sex and he brushes an orchid across the girls stomach?
Maybe, American Pie
What is the unit used of resistor?
The ohm. It is how much resistance a component or part of a circuit has to the flow of electrical charge when a voltage is induced across it.
Do vacuum cleaners have motors?
We can generally say that vacuum cleaners have motors. Carpet sweepers, in contrast, usually have a pair of brushes that rotate when the unit is pushed across the floor.
