Mell What happens when you disconnect electromagnets from an energy source?
What happens when you disconnect electromagnets from an energy source? They break apart, causing the poles to stop attracting each other. They demagnetize because the electrical current creating the magnetism has lost its energy source.
What conditions are necessary for an electric charge to have a magnetic field?
Permanent magnets are not the only objects which experience the magnetic force. Electric charges can experience a magnetic force if two conditions are met: The charge must be moving through a magnetic field. The velocity of the charge cannot be parallel (or antiparallel) to the direction of the magnetic field.
Why is power transmitted at a higher voltage?
If an amount of power is transmitted at the lower voltage the size of conductor required is much higher than the same required for power transmission at higher voltages. Hence transmission of power at higher voltages enables a reduction in conductor required for the same.
Why is high voltage transmission required between substations?
When transmission of Electricity is carried out over long distances, its happens along with voltage drop due to various losses involved along the path. With the help of High Voltage Transmission, we can reduce these losses as well as the costs involved in the conductor and hence improve the efficiency of power transmission and keep it economical.
What is the power loss of high voltage transmission?
When the Power transmission is carried out at a lower voltage (1000v), the power loss is 40 KW whereas when the Power transmission is carried out at a higher voltage (10000v), the power loss is 0.4 KW. The power loss during High Voltage transmission is much lower compared to low voltage transmission.
Why is high voltage better than low voltage?
However there are other limiting factors determining how high a voltage can be delivered practically and economically. For the following reasons: High voltage means lower current, low current means lower losses . This saves money. Lower current means you will need smaller cross-sectional area for the conductors that will be used to transfer power.