Inductor. A circuit component designed for inductance is an inductor . Symbol suggests coiled wire Ideal inductors act like wires unless the current changes. Emf based on L Real inductors have some resistance. Resistivity of length of wire. Physical Coil.
Symbol suggests coiled wire
Ideal inductors act like wires unless the current changes.
Emf based on L
Real inductors have some resistance.
Resistivity of length of wirePhysical Coil
A switch can be used to complete a circuit with a resistor.
One-loop Kirchhoff’s law
Treat as additional emf sourceRL Circuit
Change in current decreases
Never reaches zero
Overall current increases
The period of time for a decrease by a factor of e is the time constant t.Inductive Time Constant
Depends on battery voltageExponential Decay
Kirchhoff’s voltage law
Circuit current can be determined from Ohm’s lawInductor Current
The inductor will create an emf to resist the change.
For a large current the emf can create a spark.Disconnection
A pair of opposite switches can provide a safe path for current in an inductor.
A and B always in opposite position
When switch A is closed the battery powers the circuit.
When switch B is closed the inductor current flows through the switch and resistor.Safe Discharge