18 Questions
What is the main function of a dynamic microphone?
Produce a current proportional to the sound signal
How is current induced in the coil of a dynamic microphone?
By pressure variations in sound waves
What happens when current flows into the coil of a loudspeaker?
The cone moves
In a loudspeaker setup, what interaction causes the coil to move?
Magnetic field from magnet and current
Which component of a dynamic microphone is free to move?
Coil of wire around the magnet
What will happen if the magnetic field changes while a current flows through a conductor?
The current will produce its own magnetic field that opposes the change inducing it
In an electric generator (dynamo), what type of current is produced when the coil of wire is connected to a complete circuit?
Alternating current (AC)
How is direct current (DC) produced in a dynamo?
By connecting the coil to a split ring commutator
What is the function of a split ring commutator in a dynamo?
To reverse the direction of current each half-rotation
In an electric generator, what causes a potential difference to be created?
The movement of the wire cutting through the magnetic field
What type of transformer is created when there are more coils on the secondary side?
Step up transformer
What dictates the direction of the magnetic field produced around a wire carrying current?
The right hand grip rule
What happens to the strength of the magnetic field when the current passing through a wire increases?
It increases
What shape does the magnetic field take in a solenoid?
Circular
How does having an iron core in the center of a solenoid affect its magnetic strength?
Increases it
What factors affect the strength of a magnetic field produced by a solenoid?
Size of current and length
In the motor effect, how do two magnets interact with each other?
They experience magnetic force of attraction/repulsion
What is the direction of the force felt on a wire when it interacts with a magnetic field?
Perpendicular to both the wire and the magnetic field lines
Test your knowledge on the functioning of electric generators (dynamos). Learn about how a coil of wire rotating between two permanent magnets generates electricity through the interaction of magnetic fields.
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