1

00:00:00,266 --> 00:00:05,266

Hello everyone, in this lesson we will learn about the OR gate in the gate circuit

2

00:00:06,666 --> 00:00:10,466

The circuit symbol of the OR gate is shown in the figure

3

00:00:11,200 --> 00:00:14,366

It also has two inputs, an output

4

00:00:15,900 --> 00:00:19,400

The operation logic of the OR gate is shown in the figure below

5

00:00:20,400 --> 00:00:23,233

It has A, B two switches

6

00:00:25,700 --> 00:00:33,266

When any switch is closed, the circuit can form a loop, and the small bulb can light up

7

00:00:34,833 --> 00:00:41,200

So the operation logic of the OR gate is that as long as one input level is high level,

8

00:00:41,800 --> 00:00:45,500

it can output high level

9

00:00:46,966 --> 00:00:52,966

The operation logic of the OR gate can also be recorded as OR addition,

10

00:00:53,400 --> 00:00:56,633

that is, A plus B equals C

11

00:00:57,133 --> 00:01:01,900

A, B, and C all have only two values, either 0 or 1

12

00:01:02,000 --> 00:01:07,900

When both A and B are 0, their addition equals 0

13

00:01:08,566 --> 00:01:15,000

When one is 1 and the other is 0, the result of the addition is 1

14

00:01:16,500 --> 00:01:21,266

When both A and B are 1, they add up to 2

15

00:01:22,900 --> 00:01:28,766

But there is no concept of 2 in digital circuits, so the result is still 1

16

00:01:29,600 --> 00:01:33,366

This is the operation logic of the OR gate, or addition