Hello. Can a neutral be used in a standard Step Down Transformer converted to a Step Up Transformer? We connected 120VAC (Hot & Neutral) to the Input Side (reversed) and wired the Output Side to the 220 Taps (2 legs) to equal 220 Volts at the Panel connections. The problem that we have is Unbalanced when you measure voltages to ground. We have 148VAC to one leg and 69VAC to the other leg measured to ground with the meter. We don't think this is correct. It seems the current would shift to the lower voltage leg if the panel is loaded. I appreciate your opinion with this connection.
Interesting series. Has the GCSE syllabus changed significantly over the last few years? Because topics like motors, electromagnetic induction, or even the SUVAT equations, were certainly not taught to me when I did my GCSE's 4 years ago.
I suspect that the syllabus has not changed that much. But the different exam boards have significantly different material in their syllabuses. I am trying to cover all the ground so it is quite possible that some of the material does not feature in every syllabus. Nevertheless, I hope it provides a very useful grounding for the basics of physics.
Some Follow Questions to check pupils took it all in? When we say step-up and step-down transformers, what are we stepping up or down? What is a common material used for the core of a transformer? Why do you think this is a good material to use? What does Vp stand for? What does Vs stand for? For a transformer to work, what can you say about the number of coils on either side of the core? Why do transformers not work with a Direct Current (DC)? You only induce a current in a coil of wire when the magnetic field is …………….? Think about how this explains why transformers only work with Alternating Current, not with Direct Current. What does np an ns stand for? What formula links Vp, Vs, ns and np? Did you notice how the narrator showed FULL WORKING OUT by listing the equation he was using, listing the variables, rearranging his formula, substituting the numbers and leaving an answer WITH THE UNITS? What is unique about an isolating transformer? Why would you use them? Why are transformers not quite 100% efficient (even though we assume them to be!)? What can we say about the power going into a transformer and the power coming out of a transformer? What formula links Vp, Ip, Vs, Is? What do you usually use transformers for in every day life? What type of step-down transformers do you usually use to charge your phone? What are the benefits of using this type of transformer?
1) we are stepping up and down the voltage 2)a common material is the iron core which is used because it is easily charged and discharged 3) vp = primary voltage 4)vs = secondary voltage (on the other end) 5)if the number of turns coming from the supply is greater than the number of turn on the other end then the transformer will be a step down transformer... And if the number of turns coming from the supply will be lesser than the number of turns on the other end it will be a step up transformer 6)tranfromers dont work with dc current as direct current flows only cuts the magnetic flux once and a little voltage is induced and then it stops... but ac current as alternates and flows positively and negatively it continuously induces voltage 7)np = number of turns of coil on the side coming from the supply and ns = number of turns on the output end 8) an isolating transformer reduces the risk of voltage fluctuation and makes the wiring and circuit more stable(they do not alter the current or voltage from the supply) 9)some energy is always lost in the form of heat so the efficiency is not a 100% 10)the power always remains constant 11) Vp x Ip = Vs x Is 12) transformers are used by power stations... firstly the power houses use a step up transformer so that the voltage travels to us quickly and then a step down transformer is used to make the voltage usable for our houses and devices 13)small step down transformers are built in our chargers of phones and laptops as they are fragile and are sensitive to high voltages 14)it reduces the voltage coming from the switch board and makes it usable for the phone or laptops RATE MY ANSWERS OUT OF 10
Dear Sir In last example, Why we choose in NP must be 60 turns??? From where you find 60 turns??? For wiring we could choose even wire larger??? Core transformer , what materials must chosen??? Many Thanks. FR.
DrPhysicsA can you pls write what the isolating transformer is. I searched it and it says this device isolates the powered source (i.e computer) from the power source. Does that mean the device is working but it is protected cuz of isolated transformer. Basically it is safe to use. I am right? Thanks beforehand!
In 3:36 why does the voltage have to be a.c and cannot be d.c ? And can you cover a topic on a.c and d.c because i don't understand what they actually does.
these lectures have little explanation for thing that really matters . he just them by brute force method ! It is AL , I am in Electrical Engineering , so that may be the trouble I have !!
This guy is super amazing. A difficult topic explained with such skills that made it look very easy.
How could somebody not like this high quality lesson ...?
Very well explained. Helped me a lot thanks
Thank you so much! Your tutorials are very helping.
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Hello. Can a neutral be used in a standard Step Down Transformer converted to a Step Up Transformer? We connected 120VAC (Hot & Neutral) to the Input Side (reversed) and wired the Output Side to the 220 Taps (2 legs) to equal 220 Volts at the Panel connections. The problem that we have is Unbalanced when you measure voltages to ground. We have 148VAC to one leg and 69VAC to the other leg measured to ground with the meter. We don't think this is correct. It seems the current would shift to the lower voltage leg if the panel is loaded. I appreciate your opinion with this connection.
you are the best
Interesting series. Has the GCSE syllabus changed significantly over the last few years? Because topics like motors, electromagnetic induction, or even the SUVAT equations, were certainly not taught to me when I did my GCSE's 4 years ago.
I suspect that the syllabus has not changed that much. But the different exam boards have significantly different material in their syllabuses. I am trying to cover all the ground so it is quite possible that some of the material does not feature in every syllabus. Nevertheless, I hope it provides a very useful grounding for the basics of physics.
Some Follow Questions to check pupils took it all in?
When we say step-up and step-down transformers, what are we stepping up or down?
What is a common material used for the core of a transformer? Why do you think this is a good material to use?
What does Vp stand for?
What does Vs stand for?
For a transformer to work, what can you say about the number of coils on either side of the core?
Why do transformers not work with a Direct Current (DC)?
You only induce a current in a coil of wire when the magnetic field is …………….? Think about how this explains why transformers only work with Alternating Current, not with Direct Current.
What does np an ns stand for?
What formula links Vp, Vs, ns and np?
Did you notice how the narrator showed FULL WORKING OUT by listing the equation he was using, listing the variables, rearranging his formula, substituting the numbers and leaving an answer WITH THE UNITS?
What is unique about an isolating transformer? Why would you use them?
Why are transformers not quite 100% efficient (even though we assume them to be!)?
What can we say about the power going into a transformer and the power coming out of a transformer?
What formula links Vp, Ip, Vs, Is?
What do you usually use transformers for in every day life?
What type of step-down transformers do you usually use to charge your phone?
What are the benefits of using this type of transformer?
1) we are stepping up and down the voltage
2)a common material is the iron core which is used because it is easily charged and discharged
3) vp = primary voltage
4)vs = secondary voltage (on the other end)
5)if the number of turns coming from the supply is greater than the number of turn on the other end then the transformer will be a step down transformer... And if the number of turns coming from the supply will be lesser than the number of turns on the other end it will be a step up transformer
6)tranfromers dont work with dc current as direct current flows only cuts the magnetic flux once and a little voltage is induced and then it stops... but ac current as alternates and flows positively and negatively it continuously induces voltage
7)np = number of turns of coil on the side coming from the supply and ns = number of turns on the output end
8) an isolating transformer reduces the risk of voltage fluctuation and makes the wiring and circuit more stable(they do not alter the current or voltage from the supply)
9)some energy is always lost in the form of heat so the efficiency is not a 100%
10)the power always remains constant
11) Vp x Ip = Vs x Is
12) transformers are used by power stations... firstly the power houses use a step up transformer so that the voltage travels to us quickly and then a step down transformer is used to make the voltage usable for our houses and devices
13)small step down transformers are built in our chargers of phones and laptops as they are fragile and are sensitive to high voltages
14)it reduces the voltage coming from the switch board and makes it usable for the phone or laptops
RATE MY ANSWERS OUT OF 10
Dear Sir
In last example,
Why we choose in NP must be 60 turns???
From where you find 60 turns???
For wiring we could choose even wire larger???
Core transformer , what materials must chosen???
Many Thanks.
FR.
hello good teacher
what is the use of iron frame , what if it was absent , just the coils ? induction would still take place right ?
Yes it would but the iron frame enhances the effect. My video ua-cam.com/video/Min9oTvcYX8/v-deo.html may help.
ok dr thank for clearing the doubt
DrPhysicsA can you pls write what the isolating transformer is. I searched it and it says this device isolates the powered source (i.e computer) from the power source. Does that mean the device is working but it is protected cuz of isolated transformer. Basically it is safe to use. I am right? Thanks beforehand!
In 3:36 why does the voltage have to be a.c and cannot be d.c ? And can you cover a topic on a.c and d.c because i don't understand what they actually does.
As far as i know, Transformers will not work with DC voltage since it has a constant unchanging current that creates no change in magnetic flux.
the digram is wrong coz np greater than ns ,i think so
Ok teach
these lectures have little explanation for thing that really matters . he just them by brute force method ! It is AL , I am in Electrical Engineering , so that may be the trouble I have !!