what causes the current in a loudspeaker to go backwards and forwards
alternating voltage
I dont know the answer
It is through an implifier
Well, it's like a never-ending dance party in there! The current in a loudspeaker goes back and forth because it's being driven by an alternating current (AC). Just like when people on the dance floor move forwards and backwards to the beat, the AC current oscillates between positive and negative directions, creating the vibrations that make the loudspeaker produce sound. So, you could say that the current in a loudspeaker has some serious dance moves!
The current in a loudspeaker goes backwards and forwards due to the principle of electromagnetism. To understand this, let's break it down:
1. Electric signal: A loudspeaker works by converting an electrical signal into sound waves. This electrical signal represents the audio waveform that needs to be reproduced.
2. Coil and magnet: Inside a loudspeaker, there is a coil of wire that is attached to a diaphragm or cone. This coil is surrounded by a permanent magnet or an electromagnet. The coil is typically mounted in such a way that it can move back and forth.
3. Electromagnetic interaction: When an electric current flows through the coil, it creates a magnetic field around it. The permanent magnet or electromagnet also produces its own magnetic field. These two magnetic fields interact with each other, causing a force to be exerted on the coil.
4. Back and forth motion: The interaction of the magnetic fields causes the coil to move either towards or away from the permanent magnet, depending on the direction of the electric current in the coil. This movement of the coil then moves the attached diaphragm or cone, which generates the sound waves that we hear as audio.
5. Alternating current: The audio signal, which is an alternating current (AC), constantly changes direction. This alternating current causes the coil to move back and forth, resulting in the current in the loudspeaker going backwards and forwards as well.
In summary, the interaction between the coil's magnetic field and the permanent magnet's magnetic field causes the current in a loudspeaker to go backwards and forwards as it converts electrical energy into sound waves.