Difference between revisions of "CircuitJS/C3/OR-Gate/English"

Learning Objective

• OR Gate and
• Verify its truth table

Prerequisite

• Electrical circuits

System Requirement

• Ubuntu Linux 20.04 OS
• CircuitJS Application

OR Gate circuit.png

• 2 Switches
• 2 Resistors of 220 Ohm
• 1 DC Power supply of 5 Volts
• 1 LED

Click on File and select New Blank Circuit.

Browse through the menu

Go to the Passive Components, and then select Add Switch.

Drag and place the switch in the working space.

Right-click on the switch, then select the Duplicate option to make another one.

Place both the switches in parallel alignment as shown.

In this circuit, these switches act as INPUTs for the OR Gate.

Drag and draw the resistor as shown.

Change the resistor value to 220 Ohms using the Edit option.

Use the Duplicate option to have another resistor of 220 Ohms.

Connect one resistor each to the switches in series connection.

Click on Draw, then go to Inputs and Sources to see a list of components.

Select Add Voltage Source (2-terminal), and drag the DC power supply.

Place the power supply in the working space, as shown in the video.

Click on the Draw menu and then go to the Outputs and Labels option and

select Add LED.

Now click and drag to draw the LED in the working space.

Now let's connect the components using wires.

Give names to these switches as A and B and to the LED as Y.

OR Gate Truth Table.png

When any one of the inputs is 1, the OR Gate gives the output as 1.

If both the inputs in the OR gate are zero, then the output is zero.

Click on the center of the switch to open it.

Now we can see that the output LED is not glowing.

This indicates that the output Y is 0, as given in the truth table.

Thus the first condition is verified.

To attain this condition in the circuit, keep switch A open and close switch B as shown.

Note that the output LED is now glowing.

This indicates that the output Y is 1, as given in the truth table.

Thus the second condition is verified.

Assignment1

Image

• Using the switches and LED circuit, verify the OR gate truth table

Select Add OR Gate option.

Select Add OR Gate option.

Click and drag the cursor in the working space to draw the OR gate.

Select Add Logic Input option.

Select Add Logic Input option.

Click and drag the cursor in the working area to draw the logic input.

Press the Esc key to deselect the component wherever required.

In the pop-up window , check the Numeric box and click on the OK button to save the changes.

By doing this, the input values will be shown in either 0’s or 1’s.

As we require two logic inputs, let us select the Duplicate option.

Now we have two logic inputs.

Connect these logic inputs to the input pins of the OR gate as shown.

Select Add Logic output and draw it in the working space.

Right click on the logic output and select the Edit option.

Now, go to Draw, click on Logic gates, Input and Output.

Then Select Add Logic output and draw it in the working space.

Right click on the logic output and select the Edit option.

In the pop-up window , check the Numeric box and click on the OK button to save the changes.

By doing this, the output value will be shown in either 0’s or 1’s.

Connect the logic output to the output pin of OR Gate.

Letters A and B are the inputs and Y is the output.

Now click on the input B to make its value 1.

Notice the output value Y is 1.

It implies that when at least one of the inputs is 1, the output will be 1.

Check the remaining two conditions according to the OR gate truth table.

Let us summarize.

Summary

• OR Gate and
• Verify its truth table

• With the OR gate component, check and verify the OR gate truth table

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