Depends on the source. If your source is two 12v batteries in series you attach to the terminals of one battery only. Otherwise, you must drop the voltage by adding resistance to the circuit.
You will have a 12 Volt source with double the charge capacity.
To power a 24-volt light on a 12-volt trailer, you can use a DC-DC converter that steps up the 12 volts to 24 volts. Ensure the converter can handle the current draw of the light. Alternatively, you could connect two 12-volt batteries in series to create a 24-volt supply, but this would require proper battery management. Always ensure that wiring and components are rated for the voltage and current to prevent damage or hazards.
No. The value and polarity are different.
With an appropriately rated DC to DC converter.
can ou step down 36 volts dc to 12 volt dc using batteries
No. You need 12 volt AC to run a 12 volt AC motor, not 12 volt DC.
You will have 24 volts DC.
12 Volts DC
The RV has a 12 Volt DC power supply that operates all the 12 Volt DC items in your RV when your plugged in to 110 V AC.
No, the battery is DC not AC.
Most cars use a 12 volt system. Most cars built before about 1956 used a 6 volt system. Some, very few, use a 24 volt system.
To reduce 24 volts DC to 12 volts DC using a resistor, you can use Ohm's Law (V = IR). The required resistance depends on the load current you are working with. For example, if the load draws 1 ampere, you would need a resistor with a value of 12 ohms (R = V/I = 12V/1A). However, using a resistor for voltage regulation is not efficient and can cause power loss; a DC-DC converter is a better solution for reducing voltage in most applications.