computer, such as a speed sensor signal, or if the signal is from one computer to another. One computer may supply the voltage to the sensor which toggles the voltage to ground, and the other computer may just monitor the signal. If a wire is disconnected from the computer that supplies voltage to the sensor, the signal is lost to both computers. Logic Gates. Logic gates are the building blocks of a digital circuit. Every terminal in a logic gate will always be in one of the two binary states (0) or (1). These binary states represent the presence (1), or absence (0), of an electrical voltage. Binary (1) can be referred to as positive or ON, whilst binary (0) can be called negative or OFF. LOGIC GATES. COMP Introduction to Computer. Architecture. Electric Logic. • Logical values can easily be expressed by. an eltili itlectrical circuit. • "True" or "1" can be defined as voltage on a. OR gate. • The OR gate is an electronic circuit that. gives a gives a true output true output.