Yes. The metal frame and body of the car is electrical ground.
Unlike older vehicles, today's vehicles have computers and other electrical components that require the battery to remain connected to the vehicle circuitry full time thus requiring a small but constant use of battery power. A battery maintainer will keep a battery charged and can be connected full time without overcharging. These are pocket size version of the automatic battery charger, but only have low current capabilities of 1 amp or less.
A battery, a light bulb and a switch
There is the possibility the battery could blowup. You can damage the complete electrical system.
It could fry the battery or the electrical system on the vehicles
bulb, Motor, buzzer, battery
capacitor, inductor, resistor..
Typically DC is what you get in a battery and AC is what powers your house.
A loose earth/ground wire can prevent any of the electrical components from functioning.A loose earth/ground wire can prevent any of the electrical components from functioning.
Weak or dead battery Loose or corroded battery cables Blown fuse or fusable link
You change polarity which can very possibly damage all electrical components.
it depends of what accessories or electronic devices that switched the battery terminals. for ex. starter motor it will reverse the circulation if you reverse the polarity
Yes, the alternator provides electrical energy to keep the battery charged. If the alternator isn't functioning, the battery will discharge and there will be insufficient electrical energy to operate the ignition and other electrical components. Understand that a battery is only an electrical STORAGE device. Electrical energy is produced by the alternator. The function of the battery is to provide electrical energy for NEXT time you want to start the engine. Once the engine is started, the alternator must take care of all electrical requirements of the vehicle as well as for providing enough additional electrical energy to replace electrical energy to the battery that was last used when the engine was started.