Depending on the device to be powered, a.c. current may be used directly, or converted to d.c. Electric lighting, motors, and heating appliances, typicaly use a.c. power directly. Electronic appliances that have bipolar, semiconductor devices, convert a.c. current to d.c. due to the fact that these devices must be connected (biased) in a particular polarity. These devices would be destroyed if connected to a.c.
ac supply converted with dc supply
ac supply converted with dc supply
The generated voltage in a power station is AC voltage, not DC. So, it is never converted to AC, because it is already AC.
A grid DC tie is where AC is converted into DC, which is then converted to AC again on the other side. If you have a DC to AC transformer setup, you'd need to add a second one going the "other" way for a full DC tie station.
An alternator produces AC current but it is converted to DC by the rectifier inside the alternator.
rectifyer
we can convert a dc supply to an ac supply using inverters. Its a common operation which we observe in our daily lives dc can be converted to Ac using an undulator.
Both, in a way. Electronic components, including moth components inside the computer, need DC. However, since the power available in homes or offices is AC, a computer is designed to work with this. A computer has a power supply that internally converts AC to DC.
The engine itself emits nothing. The alternator does. The alternator emits AC, but it is converted to DC.
In a chopper type amplifier the dc i/p voltage is converted into an ac voltage, amplified by an ac amplifier and then converted back into a dc voltage proportional to the original i/p signal
Converter
Car electrics use DC current. Based around the storage of electricity in a 12v battery. Modern vehicles charge the battery, and supply power when running, using an alternator. Although the alternator generates AC, for efficiency, it is converted to DC straight away, before being applied to the rest of the circuitry.