Turbines have governors to adjust the input of energy/torque according to the load.prudhvi mohan said:In power plants alternating emf is generated by rotating loop in magnetic field which is directly proportional to angular velocity of turbine.I think it is highly impossible to maintain angular velocity of turbine constant(especially in hydro power plants).Then how are they supplying a constant rated current?
Alternating EMF, or electromotive force, refers to the voltage produced in a circuit that is constantly changing direction. In power plants, alternating EMF is generated by rotating turbines, which turn the rotors of a generator. This rotation creates a changing magnetic field, which induces an alternating current in the generator's stator coils.
The rotation of turbines directly affects the frequency of the alternating EMF. The faster the turbines rotate, the higher the frequency of the alternating EMF. This is because the frequency of the EMF is directly proportional to the speed of rotation of the turbines.
Transformers play a crucial role in the generation of alternating EMF in power plants. They are used to step up the voltage of the generated alternating current, making it suitable for long-distance transmission. They also help in stepping down the voltage to a lower level for distribution to homes and businesses.
The output of alternating EMF in power plants is controlled by adjusting the speed of rotation of the turbines. This is done by using control systems that monitor the demand for electricity and adjust the turbines accordingly. Additionally, the number of active turbines can also be adjusted to control the output of alternating EMF.
No, the alternating EMF generated in power plants cannot be stored. It needs to be constantly generated and supplied to meet the demand for electricity. However, the electricity generated by the alternating EMF can be stored in batteries for later use in homes and businesses.