Questions!!! -faraday! (1 Viewer)

[Kukudas]

Can anyone help me please^^

Q1. What is e.m.f?

Q2.Faraday's Law of Induction states 'the induced emf in a circuit is equal in magnitude to the rate at which the magnetic flux through the circuit is chaning with time' what does this mean?

Q3. How is this LAW (above) relates to the result of experiment:
'perform an investigation to model the generation of an electric current by a moving a magnet in a coil or a coil near a magnet'
some example results - when you push N pole of magnet into a coil the pointer in galvanometer moves to right.
how is the law related to the result?? -_-

Q4. e.m.f = back e.m.f?

Q5. factors affecting the size of the induced current?

Q6. How you make a generator to create a large current?

 

[mzduxx2006]

Q1. What is e.m.f?

E.M.F stands for Elector Motive Force (force experienced on a motor due to the motor effect)

Q2.Faraday's Law of Induction states 'the induced emf in a circuit is equal in magnitude to the rate at which the magnetic flux through the circuit is chaning with time' what does this mean?

I learnt differently. I learnt that the law of induction states that a "current carrying conductor [coil] travelling through a magnetic field will experience an induced current" Basically yur statement above means that the induced current within a conductor will be equal to the rate at which the magnetic flux is experienced within that circuit. Therefore relating to the principal as current increases so too does electromagnetic flux.

Q3. How is this LAW (above) relates to the result of experiment:
'perform an investigation to model the generation of an electric current by a moving a magnet in a coil or a coil near a magnet'
some example results - when you push N pole of magnet into a coil the pointer in galvanometer moves to right.
how is the law related to the result?? -_-

Our experiement was with a galvonometre. And we basically hooked it up to a transformer with the galvonmetre in the circuit as well. It relates to the motor effect as the motor effect states that "current travelling through a magnetic field will experience a force". As current increases within the circuit so too does the torque. Alongside the use of springs, the force experienced causes the needle within the galvonometre to retract, inturn calibrating a precise measurement of current the circuit is experiencing.

Q4. e.m.f = back e.m.f?

back E.M.F basically relates to the fact that an electirc motor rotates due to the torque experienced on the coil. this creates an induced E.M.F as it is travelling through a magnetic field. Back E.M.F relates to Lenz's law and guarentees that within a circuit the induced E.M.F will act against the supplied E.M.F

Q5. factors affecting the size of the induced current?

- stronger magnets = more current
- closer the magnet is to the wires = more current
- faster movement = more current

Q6. How you make a generator to create a large current?

[answer in a nutshell] basically you make it rotate more, use stronger magnets, step it up and step it down when required.

Off the top of my head these were pretty simple questions, but they require a lot of hardwork to understand the principals. Hope i helped you out!