All Flashcards
What is the effect of increasing the number of turns in a coil on its inductance?
Increasing the number of turns increases the inductance.
What is the effect of a changing magnetic field on a nearby conductor?
A changing magnetic field induces an EMF (voltage) and can cause current to flow in the conductor.
What happens when the magnetic flux through a loop increases?
An induced current is generated in the loop, creating a magnetic field that opposes the increase in flux.
What is the effect of increasing the resistance in an LR circuit on the time constant?
Increasing the resistance decreases the time constant, causing the current to reach its maximum value faster.
What causes a magnetic field according to Maxwell's equations?
A magnetic field is created by both electric currents and changing electric fields.
What are the steps to determine the direction of induced current using Lenz's Law?
- Determine the direction of the original magnetic field. 2. Determine if the magnetic flux is increasing or decreasing. 3. The induced current creates a magnetic field that opposes the change in flux. 4. Use the right-hand rule to find the direction of the induced current.
Describe the energy conversion process in a generator.
Mechanical energy is converted into electrical energy through electromagnetic induction.
Describe the energy storage process in an inductor.
An inductor stores energy in the form of a magnetic field when current flows through it. The energy stored is given by .
What is induced EMF?
Voltage generated by a changing magnetic field.
Define magnetic flux ().
The amount of magnetic field passing through an area; .
What is inductance (L)?
A measure of how much a coil resists changes in current, measured in henries (H).
Define the time constant (<math-inline>\tau) in an LR circuit.
The time it takes for the current in an LR circuit to reach approximately 63.2% of its maximum value; <math-inline>\tau = \frac{L}{R}.
What is the significance of Maxwell's Equations?
They tie together electricity and magnetism, explaining how electromagnetic waves propagate and are crucial for designing electrical devices.
What is Faraday's Law?
A changing magnetic field induces an electromotive force (EMF).
What is Lenz's Law?
The direction of the induced current opposes the change in magnetic flux that caused it.