Pin 7, lower left, is labelled GND (ground) and pin 14, upper right, is labelled Vcc. This is where the IC gets power, 0V (ground) to pin 7 and 5V (Vcc) to pin 14. Every IC needs to have power applied to work properly. There are four 2-input NAND gates.

So +Vcc needs to have a voltage above GND while -Vcc needs a voltage below GND. VCC is the higher voltage with respect to GND (ground). VCC is the power input of a device. It may be positive or negative with respect to GND, but most of the world runs on positive voltages like in a vehicle.

VCC (Voltage Common Collector) is the power supply of a device . Ground is the the reference point against which the VCC is compared. It can be positive or negative compared to GND. When the VCC is at zero colts, it is called the ground.

You will notice that pins 7 and 14 are not referenced in the logic diagrams. In 14 pin DIP packages, pin 7 is usually connected to ground (Gnd), and pin 14 is usually1 connected to the 5V power supply (Vcc). These connections must be made or the chip will not work. TTL logic circuits are not passive!

Ground is neither positive nor negative but it can *appear* to be either depending on how you define ground. Typically ground is an extremely low impedance path for current to flow and has a 0V reference voltage.

There is no difference between ground and a negative terminal, if you have defined them to be the same connection. Ground can be the negative terminal of a battery, the positive terminal, or it might be the middle connection between two series batteries.

The negative terminal of the battery is connected to your car body, so you can connect your siren’s negative terminal directly to your closest ground point (car metal body). There’s no reason to have multiple cables on your battery’s terminal.

So when the negative terminal is grounded, electrons are not actually returning to ground, but emanating from there. If the power supply is a battery, and the devices in the circuit are designed for a positive supply, then the negative terminal serves as the ground.

Grounding is achieved in an electrical system when one of the conductive wires serving as part of the circuit path is intentionally given a direct path to the earth. Without grounding, both wires are “hot,” meaning the wires are energized at the circuit voltage.

Electrical devices are “grounded” when they connect to grounding devices for safety reasons. Grounding provides a safe “path of least resistance” for stray voltage to follow. Without grounding, power surges or equipment damage could render electrical circuits dangerous or destructive.

If your outlets and electrical box are not properly grounded, appliances and electronics you are using could end up passing excess current through you, using your body as a means to complete the path to the negatively charged ground. In other words, you could be shocked or electrocuted.

Being “grounded” means that you’re present in your body and connected with the earth. When you’re grounded, you allow yourself to feel centered and balanced no matter what’s going on around you. If you aren’t grounded, you’re like a leaf in the wind: very vulnerable and thrown off balance very quickly.