View source for CircuitJS/C2/Ohm’s-Law-using-CircuitJS-simulator/English





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|| '''Visual Cue'''
|| '''Narration'''
|- 
|| Slide:1

|| Welcome to the spoken tutorial on '''Ohm’s Law''' using '''CircuitJS''' simulator
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|| Slide 2:

Learning Objective
|| In this tutorial, we will learn how
* Voltage, resistance, and current are related in a circuit.
* Ohm's Law helps to understand this relationship.

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|| Slide 3:

Prerequisite
|| To follow this tutorial, you should have a basic knowledge of 
* Electrical circuits

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|| Slide 4:

System Requirement
|| To record this tutorial, I am using:
*'''Ubuntu Linux '''20.04 OS
*'''CircuitJS''' Application

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|| Slide 5:Textbook reference

'''Coverpage.png'''

'''Book Page.png '''
|| We have taken the examples from the school textbook.
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|| Slide 6: 

What is Ohm's Law?

|| Ohm’s Law equation is '''V = I x R.'''

'''V''' is the voltage across the conductor measured in Volts.

'''I''' is the current flowing through the conductor measured in Amperes.

'''R '''is the resistance provided by the conductor measured in Ohms.

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|| Ohms’ law circuit

'''Ohm’s Law Circuit.png'''

|| This is the Ohm’s law circuit shown in the textbook.

For this experiment, we need
*4 DC Voltage Supply of 1.5 Volts
*1 Resistor
*Voltmeter
*Ammeter
*Switch

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| | 
|| We will learn how to create the same circuit in '''Circuitjs''' simulator and understand the concepts.
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| | 
|| Let us open the '''circuitjs''' interface as shown.
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|| Click on the '''Draw''' option

Browse through the menu
|| In the menu bar, click on '''File''' and select '''New Blank Circuit.'''

Click on the '''Draw''' option in the menu bar.

Now, select''' Add resistor''' and click and drag to draw a resistor as shown. 
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|| Show the path to find the DC power supply and draw it

Draw => Inputs and Sources => Add Voltage Terminal

|| Now, let us add the DC power supply to the circuit.

Click on Draw, then go to '''Inputs and Sources''', and select '''Add Voltage Source (2-terminal)'''.

Drag the voltage source above the resistor.

Make sure the positive end of the voltage source is on the left side.

In this case, we need to change the voltage source's direction.

Right-click on the voltage source component and select '''Swap Terminals'''. 

You will notice the polarity of the voltage source changes.

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|| 
|| We want a DC voltage source of 1.5 volts, but it's set to 5 volts by default.

To change it, right-click the voltage source.

Then select the '''edit '''option.

A pop-up window will open.

Delete the value 5 and type 1.5 and click the OK button to save the change.
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|| 
|| We need three more of these same DC voltage sources connected one after another.

Right-click on the DC voltage source, and select the '''Duplicate''' option.

Do this, two more times to make three copies of the DC voltage source.

Move and link all four DC voltage sources together in a row as shown.

Make sure the parts don't overlap when you connect them.

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|| 
|| Next let us label these voltage sources.

Click on the '''Draw''' button, then go to '''Output and Labels''' and select

'''Add Text.''' 

Move the cursor to the working space and click and drag.

A default hello text will appear.

Double click on the hello word to edit the text to V1 and click on the OK button.

Repeat the same steps and label the other voltage sources as V2,V3 and V4.

Arrange the label for a neat look.
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|| Draw => Outputs and Labels => Ammeter
|| To measure the current in the circuit, we'll use '''Ammeter'''.

Click on the '''Draw''' button, then go to '''Output and Labels''' and select '''Add ammeter'''.

Now, connect the ammeter to the resistor in the circuit.
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|| Draw => Outputs and Labels => Voltmeter / Scope probe
|| Let us add a '''voltmeter''' across the resistor to see the amount of voltage passing through it.

Click on the '''Draw''' and select '''Outputs and Labels''' and select '''Add Voltmeter/Scope probe'''.

Place it below the resistor as shown.
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|| Draw => Passive Components => Switch
|| We also need a Switch to turn ON and OFF the circuit.

In the '''Draw''' menu, select '''Passive components''' and '''Add switch.'''

Drag and connect the switch next to the '''Ammeter'''.
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|| 
|| We have all the required components in the work area. 

Now let's connect the components using wires.
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|| Add Wire

Draw => Add wire
|| From the '''Draw''' menu, select '''Add wire.'''

Connect the resistor and voltmeter as shown.

You will notice a white dot at the end points of the connection.

This dot represents a junction which also implies the connection is right.
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|| 
|| Connect the positive end of the V1 power supply to the resistor as shown.

Create a wire connection between the '''Switch '''and V1 power supply as shown.

Observe the yellow dots indicating the current flow direction in the circuit.
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|| 

|| Observe the current reading across the Ammeter. 

Place the cursor on the resistor component.

You will see its characteristics at the right bottom of the screen.

Current flowing through the resistor denoted by I is 1.5 milliAmpere.

The voltage across the resistor denoted by Vd is 1.5 Volts.

You can see the resistor value denoted by R is 1K Ohm.

Make sure to write down the readings of each component in the circuit.

Note the current readings in milliamperes (mA). Convert to amperes (A) and record the current accordingly.
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|| '''Slide:'''

'''Ohm’s Law: Relationship I,V,R'''

'''I = V / R'''

'''V = I x R'''

'''R = V / I'''
|| Ohm's Law helps us find the third parameter when we know any two parameters:
*To calculate the current, the formula becomes, 

'''I = V/R'''
*To calculate the voltage, the formula becomes, 

'''V = IxR'''
*To calculate the resistor, the formula becomes, 

'''R = V/I'''
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|| 
|| This brings us to the end of the tutorial. Let us summarize.
|-
|| '''Slide summary'''
|| In this tutorial, we learnt how
*Voltage, resistance, and current are related in a circuit.
*Ohm's Law helps to understand this relationship.

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|| Assignment 1
|| As an assignment do the following

#In the same circuit, change the resistor value from 1K ohms to 10K Ohms

'''Tips:'''

To change the value of any component, select the component and right click and select edit option to change the values.
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|| Assignment 2

|| 
#Do the circuit connection as shown in the image, i.e. use both A '''and B power supply in the circuit'''
#'''Keep the resistor value as 10K Ohms'''
#'''Calculate the current (in mA) flowing through the circuit.


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