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Electromotive force (emf) can be produced through several methods, the most common being electromagnetic induction, where a changing magnetic field induces a voltage in a conductor. This can be achieved by moving a magnet near a coil of wire or by rotating a coil within a magnetic field. Additionally, emf can be generated through chemical reactions in batteries or through photovoltaic effects in solar cells. Each method relies on the fundamental principles of physics to convert energy into electrical potential.
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Why we don't use starters for small motors?
When motor is started it has low speed which does not produce back emf hence very large current is drawn by the motor which may destroy the coil inside.small motors gain speed very quickly they produce back emf very fast at start hence they do not require starter.
How are emf measured?
emf in volts
What are the Example each for self induced and mutually induced emf?
if an emf is induced in a coil due to the current flowing through itself is called SELF INDUCTANCE. on the other hand if an emf is induced on another coil due to the current flowing through the previous coil then it is called MUTUAL INDUCTANCE. suppose there are two coils A and B a current is flowing through A. now if the flux produced due to this current induce an emf on the same coil A, then it is SELF INDUCTANCE, and if it produce emf on B, then it is MUTUAL INDUCTANCE due to coil A.
Does motional emf call induced emf?
yes indused emf is also called motional emf. If an open coil is subjected to a variable magnetic field, at the ends of the coil a potential difference is induced which is called induced emf. If a coil is connected to an emf source and switched on, the rising current will produced an variable magnetic field which in turn produces an emf. It is called back emf.
While discharging which is greater TPD or EMF?
EMF is greater
Can you produce a energy from emf?
yes it can be produced
What three things are required to produce EMF in an alternator?
Three things required to produce electromotive force (EMF) in an alternator are a magnetic field, a conductor, and relative motion between the magnetic field and the conductor.
What is voltage sources?
It is the souce that produce the emf force that drive the electron in a metal material
Why do bananas produce emf?
Bananas produce electromagnetic fields (EMF) primarily due to the presence of potassium, which is a key component in their cellular structure. Potassium ions are involved in various biological processes, including cellular communication and electrical activity, which can generate EMF. Additionally, the metabolic processes within bananas, such as respiration and photosynthesis, can contribute to the production of weak electromagnetic fields. Overall, the EMF associated with bananas is a result of their biochemical composition and biological functions.
Does a magnetic field produce electricity?
ANSWER yes. When it moves it induces EMF in metals, laser beams, gravity field and other magnetic fields. Move as in expand and contract or as in moving the EMF generator.
Why magnet is used for making standard resistance coil?
magnet produce emf it maintain the resistance as same
Can TV and Radio towers produce EMF?
Well, it's not actually the tower that produces the EMF. It's the RF energy radiated by the antennas that are mounted on the tower. That energy produces EMF in receiving antennas, which alternates (wiggles) at the frequency of the transmitted signal. All of this is very lucky. Without that little EMF induced in the receiving antenna, there would be no such thing as radio communication.
What will happen if generator is overexcited?
if a generator is overexcited it is producing a large amount of reactive power which requires an increase in the alternator emf. To produce this emf, the rotor currents must increase resulting in extreme ohmic rotor losses.
Are Emf in innerspring mattresses?
Innerspring mattresses typically do not generate significant electromagnetic fields (EMF) as they primarily consist of metal coils and fabric, which do not produce electromagnetic radiation. However, if the mattress contains electronic components, such as adjustable features or built-in heating elements, there may be some EMF generated from those components. Overall, the EMF levels from standard innerspring mattresses are generally low and considered safe for most users.
Why we don't use starters for small motors?
When motor is started it has low speed which does not produce back emf hence very large current is drawn by the motor which may destroy the coil inside.small motors gain speed very quickly they produce back emf very fast at start hence they do not require starter.
How are emf measured?
emf in volts
Why emf of battery driving potentiometer is greater than emf of the cell to be measured?
Bcoz the emf which is to be measured is less than emf of driving cell....
