Because the electrons flow in one direction only batteries produce direct current.
Car battery ac or dc current.
Dc direct current is the streaming of electrons towards a single direction.
Dc voltage is usually marked as a v followed by a short line with a dotted line beneath it.
The current in a automobile is dc you have a battery which is dc and your alternator produces ac current but converts it to dc inside the alternator unit which gives your battery dc power.
Thomas edison used direct current for the first electric power transmission systems he invented.
Ac dc there are two types of electricity alternating current ac and direct current dc.
What are ac and dc.
Select the dc volts position on your multimeter or the 12v setting if you have a dedicated car battery test range.
The wavy line after a v is ac alternating current voltage and is for checking the mains voltage in your house.
Alternatively ac alternating current is a streaming of electrons where they continuously change the direction.
The inverter then converts the 12 volt dc power to 110 volts ac or house current.
In reality a vehicle battery or any other type of battery emits a dc voltage.
Your household appliances on the other hand operate at 110 120 volts of alternating current meaning that the current flows in alternating pulses at 60 mhz not a steady direct flow of electricity as occurs in a dc battery.
Car batteries operate on direct current flowing at 12 volts.
The batteries that use dc power up small electronic appliances and gadgets like laptop radio microwave and more.
For example alternating current can be produced by a dc battery when it is joined with an ac converter.
A car battery always produces dc voltage.
Batteries can be charged just by dc as well which is why all ac power is instantly transformed to dc when a battery is the main part of a system.
When batteries discharge they emit a constant dc power in one direction supplying electricity through the positive terminal to the negative.