Phases and Inductance (2) Flashcards
In a simple resistive circuit, ____ and ___ are in “phase” with each other.
voltage and current are in “phase” with each other.
____ leads the ____ by 90° phase to push current through the coil due to the opposing inductive reactance (XL)
voltage leads the current by 90° phase
What is the name for the diagrams that shows the typical ET instruments electrical circuit?
Wheatstone Bridge - based on original bridge circuit 1833
Parts of a simplified bridge circuit
- AC power source
- Voltmeter
- Balance Resistor
- Probe Coil
- Current Flow
Define Electromagnetic Induction
the process of inducing an electrical current in a conductor by bringing the conductor in contact with a magnetic field.
- conductor perpendicular to mag field
- expose to a alternating mag field
Unit for Induction
Henries (L) - Heinrich Lenz
What is Self-Inductance?
Inductance is when induction occurs within a circuit and affects current flow, self induction is inductance in a coil or solenoid.
Define Inductive Resistance
Induced current runs opposite to primary current flow direction - The opposing self induced current is inductive resistance.
The greater the # of coil turns the ___ the magnetic field (coil induction (L))
greater the magnetic field (coil induction (L))
A soft iron core wrapped inside a coil will produce a ___ amount of coil induction (L)
greater the amount of coil induction (L)
The greater the coil diameter the _____ amount of coil induction (L)
greater the amount of coil induction (L)
- due to greater overall length of wire used
The greater the amount of primary current (amps) in a coil, the ____ the circular magnetic field, increasing the amount of coil induction (L)
stronger the magnetic field, increasing the amount of coil induction (L)
Increasing frequency in the primary current in the coil, will _____ the magnetic flux density in the circular fields, increasing coil inductance (L)
increase magnetic flux density in the circular fields, increasing coil inductance (L)
Define Mutual Inductance
electrical relationship between two electrical circuits with moving magnetic fields.
ET creates this - primary field generates an eddy current which generates a secondary field, that turns opposing to the primary field current direction.
