Use a fuse
You need a DC power supply in order to connect a 24v DC motor to household power.
If you want to convert 24v AC into 12v Ac, it's simple. Just get a transformer to convert 24 volts into 12 volts. This is called a stepdown transformer. If you want to convert 24v DC into 12v DC, it's more complicated. First you have to change the 24v DC into 24v AC by a switching converter that changes DC into AC. Then you would use a stepdown transformer as in the former example. Once the 24v AC is converted to 12v AC, then you use a rectifier bridge to change the 12v AC into 12v DC.
because it dc not ac
Apply 24v and listen for click Ck coil for open with ohmmeter Clean contacts if possible
input 220v ac & output 24v dc
The wattage would stay the same. It is the amperage that would change.
You don't. The solenoid's voltage rating means that it needs that much voltage to operate correctly.
It can't. You home runs on 120 volts AC not DC power from a battery.
multiplies source voltage, two 12v dc batteries in series become a 24v circuit; also multiplies resistence
Like to run on a DC powered machine? Probably the easiest and safest way would be to buy a standard power inverter.
commonly with a single dc power source to isolate ac loads from other parts of the circuits. in dc power supplies to remove ripple