The difference between AC and DC has to do with the direction in which the electrons flow.
In DC, the electrons flow steadily in a single direction ("forwards").
In AC, electrons keep switching directions, sometimes going "forwards" and then going "backwards."
we know that "power developed by the armature" is equal to
(total magnetic loading) * (total electric loading) * (speed in rps)
=>( Bav * 3.14 * D*L) * (q * 3.14 D) * (N / 60) * 10-3 KW
= [(3.142/60) * Bav * q * 10-3 ] * (D2*L*N)
= (Co D2 L N) KW
the above equation is the output equation of DC machine in terms of its main dimensions..
where, Co = (3.142/60) * Bav * q * 10-3 which is known as output coefficient.
he difference between AC and DC is that AC is an alternating current (the amount of electrons) that flows in both directions and DC is direct current that flows in only one direction; the product that is flowing being electrons. AC power is what fuels our homes. The wires outside of our house are connected at two ends to AC generators. DC is found in batteries and solar cells. Both AC and DC employ magnets to repel electrons. Electrons are negatively charged particles that are one of 3 components that make up an atom. Negative charges will repel negative charges and positive charges will repel positive charges, so one only needs to introduce a negatively charged item next to electrons to force them to move in the opposite direction. Likewise, you can attract electrons by introducing something that is positively charged into their environment drawing the electrons to it. This property of electrons is what allows for AC power to work; that is, they switch directions constantly. The picture to the left is a demonstration of AC power at work. The constant switching of directions is evident in the dotted appearance of the light lines. DC power was invented by Thomas Edison and first used to power our homes in the late 1800's. Its main drawback being that in order to receive DC power from a generating station, your home had to be located within a one mile radius of the station. DC power degrades as it moves away from its generating source; the further away, the less power. In addition, it is difficult to convert very high power DC current into the lower power current needed in our homes. Nikola Tesla discovered AC and sold his design to Westinghouse. AC power degrades very little over 100's of kilometers. When the power reaches an electrical pole outside our homes, a transformer converts to high voltage (the amount of energy carried with the electrons) to the low voltage needed to fuel our appliances. To convert AC to DC, a device needs an item called a rectifier. Many monorail systems use DC power. In addition, if you have a portable stereo, you may notice a button on the back that can switch from AC to DC; this means that you can power your device by plugging it in (AC) or by using batteries (DC).
yes if it is a series motor
no if its a shunt motor
most small power tools have dc motors
the difference being the field windings have laminated iron cores
sometimes called universal motors
they run cooler on dc
they have more torque on dc
the field poles dont have to be reversed 60 times every second
Hai, According to me, dc motor will not rotate if it is connected to ac supply. The Dc motor is designed in such a way that it should reach constant signal. If ac i.e., alternating signal is applied, for the first half cycle if say it tries to rotate in clockwise direction, in the second half cycle it will try to rotate in opposite direction, obviously resulting the DC motor in still position..
a dc machine is an electromechanical conversion device
dc machines are of two types basically. they are dc generators and dc motors. dc generators convert mechanical energy into electrical energy and it works on flemmings right hand rule(frr).while a dc motor converts electrical energy into mechanical energy and it works on flemmings left hand rule(flr)
An induction motor is, at its core, an inductor. When you present DC to an inductor, current increases linearly (proportional to inductance over time) until the limits of the power supply or the inductor are reached. Many times, that results in damage of one sort or another.
D.C motor works on direct current. and by changing its polarity we can change the direction of motor shaft. where in A.C motor this all not happening it and it works on alternative current
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Alternating, not "alternative" current. Some types of AC motor can be reversed by reversing the relative polarities of windings.
depends on the circuit, but typically the circuit would only receive the positive cycle of voltage needed (non-sinusoidal), also the AC components would not allow the current to flow (e.g. electrolytic capacitors). this is very dangerous and I recommend you never try this
Yes, DC current can damage AC equipment. The AC equipment is designed with a certain inductive and/or capacitive reactance, which is the reactionary current opposing changes in current and/or voltage, causing a certain impedance. This impedance is related to frequency. If the frequency is zero, as it is in a DC source, then the impedance can be far too low (or too high). That can (in the far too low case) cause excessive current flow, damaging the equipment. In the best case, the equipment won't function. In the worst case, well... just hope and pray that the protective device trips first.
The work done by a machine.
efficiency is a product of the input versus the output
I am pretty sure that such machines come in different sizes, and therefore in different capacities. Consult the technical specifications of individual manufacturers if you want to know the output of a specific machine type.
a balance equation when it come to bio is that the input be exactly equal to the output. this will make the organism balanced with the environment it is in like a regulator fish in water. input=output. in chemistry: A balanced equation is used for chemical reactions. When the number of moles of reactants is equal to the number of moles of products, the equation is considered balanced. Search wikipedia for chemical equation for a step by step tutorial on how to balance chemical reaction equations.
The correct spelling is 'brake' rather than 'break', but the 'drum' you refer to is used when testing the output power at the shaft of an induction motor. The diameter will depend on the power of the motor, and the test equipment used. 'Brake power' refers to the output power of the machine measured in watts or, in the United States, in horsepower. If you know the output power (by conducting this test) and the input power (using a wattmeter), then you can determine the machine's efficiency.
Vo=(R2/R1)(V2-V1)
the equation of mechanical advantage isFout (force, output)divided byFin (force input)the equation for Ideal mechanical advantage isDin (distance, input)divided byDout (distance, output)hope this helps a bit
Efficiency is the common term for any thing. Usually we give input to perform an act and we derive some output because of that. As far as material machines are concerned definitely output power cannot exceed input power due to conservation of energy. Therefore the ratio of the output power to that of input is defined as efficiency of the machine. Usually it will be given in percentage by muliplying the decimal by 100.
the comparison of a machine's output work toit's
Lubricating a machine affects the output force exerted by the the machine by allowing more movement because the more movement means more output.
The work done by a machine is called work output
Lubricating a machine affects the output force exerted by the the machine by allowing more movement because the more movement means more output.
Answer: Output force is the force exerted on an object by a simple machine.
Output(input), or O(i)
The equation for ideal mechanical advantage is: Output force/input force, Or input distance/ output distance.
The Output force is the force exerted by a machine.
The ratio of output force to input force for a machine is called its mechanical advantage.