103F Emf Flashcards
(23 cards)
EMF PRODUCTION TYPES
Chemical, heat, pressure, light,magnetism,electrostatics
If Battery is Dead it is Blanced
True
Connecting various electrodes in different configurations creates batteries of different voltage ?
True
Emf producing with Heating junction of Two dissimilar metals is called SEEBECK EFFECT
True
Pressure ( Push electricity) to produce electricity [emf] is Called PIEZOELECTRICITY. Tq
True
Solar Light is electromagnetic radiation
,TQ,
and it’s a form of energy
True
Magnetic ability to attract magnetic material .Magnets affect material in varying degrees …..tq
True
Magnetic moment in a group of atoms Align it’s a (Magnetic Domain)….tq
True
There is a temporary magnet
True eg coil
Hvac/R we use temperature magnetic in
Relays, Contactors, control valve and motors
Permanent magnetic in a natural state in LODESTONE
True
Two Behaviors of line of forces of magnetic field
Repel and Attract
The Symbol B represents Flux density
True
Permeability is the ability of material to magnetic lines of forces as compared to Air .
True
Soft iron has high permeability
True
Air has low permeability
True
Reluctance is resistance of Magnetic flux
True
Left hand rule
Thumb =direction of current
Curve fingers = direction of Force
Three factors Affecting Coil magnetic field
Current in coil
Num of turns of wire in coil
Core type in coil
Inductance opposes changes in current and acts like resistance
True
The symbol of inductance is L
True
The unit of inductance is Henry (H)
1H = 1Amps/sec per Volt
True
Mutual induction occurs when one circuit courses induced voltage in Another circuit nearby
True
