Karwanjehimanshi95: Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- || 00:01 || Welcome to this spoken tutorial on '''Faraday's Electromagnetic Lab'''. |- || 00:06 || In this tutorial, we will demo..."

2019-10-10T06:40:13Z

Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- || 00:01 || Welcome to this spoken tutorial on '''Faraday's Electromagnetic Lab'''. |- || 00:06 || In this tutorial, we will demo..."

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{|border=1
||'''Time'''
||'''Narration'''
|-
|| 00:01
|| Welcome to this spoken tutorial on '''Faraday's Electromagnetic Lab'''.

|-
|| 00:06
|| In this tutorial, we will demonstrate,'''Faraday's Electromagnetic Lab PhET simulation'''.
|-

|| 00:14
|| Here I am using: Ubuntu Linux OS version 14.04
|-

|| 00:20
||Java version 1.8.0
|-
|| 00:24
||Firefox web browser version 61.0.1

|-
|| 00:29
|| To follow this tutorial, Learner should be familiar with topics in high school Physics.

|-
|| 00:36
|| Using this simulation we will be able to, Predict the change in magnetic field as the magnet moves
|-
|| 00:44
|| Study the deflections of compass with respect to the magnetic field
|-
|| 00:49
|| Compare the change in voltage with an induced '''EMF'''
|-
|| 00:52
|| Explain the cause of electromagnetic induction
|-
|| 00:57
|| Explain the working of a '''transformer'''
|-
|| 01:00
|| Show how a '''generator''' works

|-
|| 01:03
|| For more information please see the additional material provided along with this tutorial.

|-
|| 01:09
|| Use the given link to download the '''simulation'''.

|-
|| 01:13
|| I have already downloaded '''Faraday's Electromagnetic Lab simulation''' to my '''Downloads''' folder.

|-
||01:20
|| To run this '''simulation''', open the terminal.

|-
|| 01:23
|| At the prompt type '''cd Downloads''' and press '''Enter'''.

|-
|| 01:29
|| Now type, '''java space hyphen jar space faraday_en.jar''' and press '''Enter'''.

|-
|| 01:40
|| '''Faraday's Electromagnetic Lab simulation''' opens.

|-
|| 01:45
|| '''Simulation''' interface has five tabs,'''Bar Magnet''','''Pickup Coil'''
,'''Electromagnet''','''Transformer''','''Generator'''.

|-
|| 01:58
|| By default '''Bar Magnet''' tab opens.

|-
|| 02:02
|| On the screen we see, a bar magnet with north and south poles marked and a compass.

|-
|| 02:09
|| Magnetic lines of force are seen spread across the screen.

|-
|| 02:14
|| A visual cue '''Move me or me''' is also seen.

|-
|| 02:19
|| This visual cue prompts us to drag the magnet or the compass.

|-
|| 02:24
|| Let us change the needle spacing and needle size.

|-
|| 02:28
|| This helps us to view the magnetic lines of force clearly.

|-
|| 02:33
|| Click on '''Options''' menu and select '''Field Controls'''.

|-
|| 02:38
|| '''Field Controls''' dialog box opens.

|-
|| 02:42
|| In the dialog box, we have sliders for '''Needle spacing''' and '''Needle size'''.

|-
|| 02:49
|| Drag the '''Needle spacing''' slider to 60 and '''Needle size''' slider to 50x14(50 by 14).

|-
|| 02:57
|| You can change the sliders as per your requirement.

|-
|| 03:01
|| Click on '''OK''' button and observe the changes.

|-
|| 03:05
|| Drag the magnet around the screen.

|-
|| 03:08
|| Note that, magnetic lines of force align and rearrange as we drag the magnet.

|-
|| 03:14
|| Now drag the compass around the magnet.

|-
|| 03:17
|| Note that compass needle aligns according to the magnetic lines of force.

|-
|| 03:23
|| On the right panel, we have '''Bar Magnet Strength''' slider.

|-
|| 03:28
|| Slider can be set between 0 to 100 percent.

|-
|| 03:34
|| At 0% strength we do not see any magnetic lines of force.

|-
|| 03:40
|| As we drag the slider towards 100%, magnetic lines of force are seen clearly.

|-
|| 03:47
|| Click on '''Flip Polarity''' button on the right panel.

|-
|| 03:51
|| Polarity of the magnet changes.

|-
|| 03:54
|| Change in polarity changes the direction of lines of force and compass needle.

|-
|| 04:00
|| Click on '''See Inside Magnet''' check box in the right panel.

|-
|| 04:05
|| Observe the direction of lines of force inside the magnet.

|-
|| 04:09
|| Click on '''Show Field Meter''' check box in the right panel.

|-
||04:14
|| '''Field meter''' shows up on the screen.

|-
|| 04:17
|| Drag the '''Field meter''' around the field.

|-
|| 04:20
|| It displays the changing values of, Magnetic flux density '''B''', x component of B('''Bx'''), y component of B('''By''') and angle of deflection('''Ө''').

|-
|| 04:34
|| Now click on '''Pickup Coil''' tab.

|-
|| 04:37
|| This screen demonstrates '''Faraday's law of Electromagnetic induction'''.

|-
|| 04:42
|| '''Pickup Coil''' screen has a magnet and a coil connected to a bulb.

|-
|| 04:48
|| '''Pickup Coil''' panel is added to the right panel.

|-
|| 04:52
|| The bulb acts as an '''indicator''' in the circuit.

|-
|| 04:56
|| Here we can either drag the magnet towards the coil or coil towards the magnet.

|-
|| 05:03
|| The most effective way is to drag the magnet towards the coil.

|-
|| 05:08
|| This is because, moving a magnet induces magnetic field around the coil.

|-
|| 05:14
|| Let us drag the magnet back and forth through the coil.

|-
|| 05:18
|| Observe that bulb glows.

|-
|| 05:21
|| This is due to the induced '''EMF''' in the coil.

|-
|| 05:25
|| This creates changing magnetic field around the coil.

|-
|| 05:29
|| Now let us increase the number of loops to 3 in the '''Loops''' input box.

|-
|| 05:34
|| Then drag the '''Loop Area''' slider to 100%.

|-
|| 05:38
|| Drag the magnet through the loop.

|-
|| 05:41
|| Observe the glow in the bulb.

|-
|| 05:44
|| The intensity of the bulb changes as we drag the magnet.

|-
|| 05:50
|| As an assignment, Replace the bulb with voltage meter.

|-
|| 05:55
|| Observe the change in the induced '''EMF''', when Magnet is moved rapidly, Polarity of the magnet is flipped

|-
|| 06:05
||Explain your observation.

|-
|| 06:09
|| Click on '''Electromagnet''' tab.

|-
|| 06:12
|| This screen has an electromagnet with its magnetic lines of force and a compass.

|-
|| 06:18
|| Electromagnet has a 10 v battery as a source of current.

|-
|| 06:23
|| This Battery has a voltage slider to control the voltage.

|-
|| 06:28
|| By default electromagnet has '''DC Current Source'''.

|-
|| 06:33
|| Here '''DC''' electromagnet creates a constant magnetic field.

|-
|| 06:38
|| Click on '''Show Field Meter''' check-box.

|-
|| 06:42
|| Place the '''field meter''' on the coil.

|-
|| 06:45
|| Gradually decrease the voltage of the battery from 10 volt to 1 volt.

|-
|| 06:51
|| Observe the change in speed of electrons on the coil with change in voltage.

|-
|| 06:57
|| The speed of electron movement decreases as voltage is reduced from 10 volt to 1 volt.

|-
|| 07:04
|| Magnetic field disappears at zero voltage.

|-
|| 07:08
|| Now, the coil is no more an electromagnet.

|-
|| 07:12
|| Continue to drag the voltage slider to the left side towards 10 volt.

|-
|| 07:17
|| Polarity of electromagnet has changed.

|-
|| 07:21
|| This changes direction of magnetic lines of force.

|-
|| 07:25
|| Notice the change in direction of movement of electrons.

|-
|| 07:29
|| Now let us switch the '''DC current source''' to '''AC'''.

|-
|| 07:33
|| Observe the continuously switching magnetic field and compass needle.

|-
|| 07:38
|| '''AC Current Supply''' is provided with two sliders.

|-
|| 07:42
|| Drag the horizontal slider to change the frequency of the wave.

|-
|| 07:47
|| Note that rate of magnetic field switching has increased.

|-
|| 07:51
|| Drag the vertical slider and check what happens?

|-
||07:57
|| As an assignment, Change the number of loops of the coil and observe the magnetic field(B) values.

|-
|| 08:06
|| Let us see how a '''transformer''' works.

|-
|| 08:09
|| Click on '''Transformer''' tab to open it.

|-
|| 08:13
|| '''Transformer''' screen has, an electromagnet with '''DC''' current source as a primary coil a '''Pickup Coil''' with '''Indicator''' as a secondary coil.

|-
||08:23
|| In the '''transformer''', primary coil induces a current into a secondary coil.

|-
|| 08:29
|| Right panel has '''Electromagnet''' and '''Pickup Coil''' boxes.

|-
|| 08:34
|| Click on '''Show Compass''' check-box in '''Electromagnet''' box.

|-
|| 08:39
|| In a '''transformer''', two coils are linked together by an iron core.

|-
|| 08:44
|| However, in this case we don't have the iron core to link the coils.

|-
|| 08:49
|| Move the coils close, so that they touch each other.

|-
|| 08:53
|| At the stationary position there is no change in the flux.

|-
|| 08:57
|| Hence, bulb does not glow.

|-
|| 09:00
|| To induce voltage in the secondary coil, magnetic field should vary.

|-
|| 09:05
|| Drag the voltage slider of the electromagnet back and forth.

|-
|| 09:10
|| As we drag, notice that bulb glows.

|-
|| 09:14
|| Also, note the deflections in the compass needle and direction of flow of electrons.

|-
||09:20
|| Next drag the primary coil in and out of the secondary coil.

|-
|| 09:25
|| Observe the change in flux as we move the coil.

|-
|| 09:29
|| Now bulb glows brightly.
|-
|| 09:32
|| From the '''Electromagnet''' box, change the '''DC''' source to '''AC''' source.

|-
|| 09:37
|| '''AC''' current in primary coil produces a changing magnetic field.

|-
|| 09:42
|| This changing magnetic field induces a voltage in the secondary coil.

|-
|| 09:47
|| Observe the change in voltage in the bulb with changing magnetic field.

|-
|| 09:52
|| In the '''AC''' current supply, increase the amplitude.

|-
|| 09:56
|| With the increase in amplitude of the wave, bulb glows brightly.

|-
|| 10:01
|| Drag the horizontal slider to increase the frequency.

|-
|| 10:05
|| Notice the fast flickering in the bulb and deflections on compass.

|-
|| 10:10
|| This is due to change in voltage in the coils.

|-
|| 10:14
|| Note that there are 4 loops on the primary coil and 2 loops on the secondary coil.

|-
|| 10:20
|| Now increase the number of loops on secondary coil to 3.

|-
|| 10:24
|| Reduce the number of loops of primary coil to 1.

|-
|| 10:28
|| Note the change in voltage of the bulb in the '''transformer'''.

|-
|| 10:34
|| As an assignment, Check what happens when frequency slider of '''AC Current Supply''' is moved to 5%?

|-
|| 10:42
||Explain your observation.

|-
|| 10:46
|| Now we will move on to '''Generator'''.

|-
|| 10:49
|| Click on '''Generator''' tab to open it.

|-
|| 10:52
||This is a simple version of a '''generator'''.

|-
|| 10:55
|| On the right panel, we have '''Bar Magnet''' and '''Pickup Coil''' boxes.

|-
|| 11:00
|| Under the''' Bar magnet''' box, click on '''Show Field''' and '''Show Field Meter''' check-boxes.

|-
|| 11:07
|| Screen has a faucet, paddlewheel with a bar magnet, '''pickup coil''', compass and '''Field Meter'''.

|-
|| 11:18
|| By default the Bar magnet is at '''0 RPM''' (revolutions per minute).

|-
|| 11:23
|| Drag and place the '''Field Meter''' close to the coil.

|-
|| 11:27
|| Drag the slider to turn on the faucet.

|-
|| 11:30
|| Observe that the bar magnet starts spinning as water falls on it.

|-
|| 11:35
||As the magnet rotates, magnetic lines of force change continuously.

|-
|| 11:40
|| Notice the change in the values in the '''Field Meter'''.

|-
|| 11:44
|| This results in the production of induced '''EMF''' in the coil and bulb glows.

|-
|| 11:50
|| Now lets increase the rotation of magnet to '''100 RPM'''.

|-
|| 11:55
|| Drag the faucet slider gradually to maximum.

|-
|| 11:59
|| Observe the rapidly changing magnetic field with increase in '''RPM'''.

|-
|| 12:04
|| Now bulb glows brightly as the voltage increases.

|-
|| 12:09
|| Pause the tutorial and do this assignment.

|-
|| 12:13
|| What changes do you see in the working of the '''generator''', when

1. Number of loops and loop area of the wire are changed.

|-
|| 12:22
||2. Bar magnet strength is reduce to 0%?

|-
|| 12:26
|| Let us summarise.

|-
|| 12:28
|| In this tutorial we have demonstrated,How to use '''Faraday's Electromagnetic Lab, PhET simulation'''.

|-
|| 12:36
|| Using this '''simulation''' we have,Predicted the change in magnetic field as the magnet moves.

|-
|| 12:43
||Studied the deflections of compass with respect to the magnetic field.

|-
|| 12:48
||Compared change in voltage with induced '''EMF'''.

|-
|| 12:52
|| Explained the cause of electromagnetic induction.

|-
|| 12:56
||Explained how a '''transformer''' works.

|-
|| 13:00
||Shown how a '''generator''' works.

|-
|| 13:03
|| The video at the following link summarizes the Spoken Tutorial project.

|-
|| 13:08
||Please download and watch it.

|-
|| 13:10
|| The '''Spoken Tutorial Project '''team:conducts workshops using spoken tutorials and gives certificates on passing online tests.

|-
|| 13:19
||For more details, please write to us.

|-
|| 13:23
|| Please post your timed queries in this forum.

|-
|| 13:36
|| This project is partially funded by Pandit Madan Mohan Malaviya National Mission on Teachers and Teaching.

|-
|| 13:34
|| Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.

|-
|| 13:41
||More information on this mission is available at this link.

|-
|| 13:46
|| This tutorial is contributed by Madhuri Ganapathi and Meenal Ghoderao from IIT-Bombay.

|-
|| 13:52
||Thank you for joining

|}

PhET/C3/Faradays-Electromagnetic-Lab/English-timed - Revision history

Karwanjehimanshi95: Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- || 00:01 || Welcome to this spoken tutorial on '''Faraday's Electromagnetic Lab'''. |- || 00:06 || In this tutorial, we will demo..."