By what means the volume of a speaker is raised..?

ie what parametres(example:current or voltage etc..)are used to raise the volume of a speaker..

Answer:
*Potentiometer.
*[One of the most common uses for modern low-power potentiometers is as audio control devices. Both sliding pots (also known as faders) and rotary potentiometers (commonly called knobs) are regularly used to adjust loudness, frequency attenuation and other characteristics of audio signals.

The 'log pot' is used as the volume control in audio amplifiers, where it is also called an "audio taper pot", because the amplitude response of the human ear is also logarithmic. It ensures that, on a volume control marked 0 to 10, for example, a setting of 5 sounds half as loud as a setting of 10. There is also an anti-log pot or reverse audio taper which is simply the reverse of a log pot. It is almost always used in a ganged configuration with a log pot, for instance, in an audio balance control.

A potentiometer used in combination with an inductor or capacitor acts as a "tone" control.]
*A potentiometer is a variable resistor that can be used as a voltage divider.

Originally a potentiometer was an instrument to measure the potential (or voltage) in a circuit by tapping off a fraction of a known voltage from a resistive slide wire and comparing it with the unknown voltage by means of a galvanometer.

The present popular usage of the term potentiometer (or 'pot' for short) describes an electrical device which has a user-adjustable resistance. Usually, this is a three-terminal resistor with a sliding contact in the center (the wiper). If all three terminals are used, it can act as a variable voltage divider. If only two terminals are used (one side and the wiper), it acts as a variable resistor.
a pot(potentiometer)controls the volume of a speaker
In short, a potentiometer is a variable resistor. When the resistance is lowered, more current is allowed to flow through the speakers, thus increasing your volume.

The converse is true for lowering the volume.

It's tough to draw a circuit, but here goes ...

.___pot____
.|.......]
.|.....speaker
.V......]
.|_________]

... consider the bottom line as the ground. V is your signal (your input voltage), pot is your potentiometer. Imagine a current flowing through the pot and the speaker. Using Ohm's Law, that current can be expressed as follows:

I = V/Rtotal = V/(Rpot + Rspeaker)

What happens as Rpot rises? Right, the overall current is decreased. Assuming a constant V, the value of the denominator is going to increase, and this will decrease the overall value of I.

For example, assume V = 10 V, and Rspeaker = 8 ohms. I know that music or sound is not going to be like DC, but the principle is still the same. If we increase Rpot to 92 ohms, the overall current in the circuit is 10/100, or 0.1 amps (V/Rtotal). The voltage drop across Rpot is V=IR= 0.1*92 = 9.2 volts, and the voltage drop across Rspeaker is 0.1 * 8 = 0.8 volts.

Now, reduce Rpot to 2 ohms. The current in the circuit is 10/10, or 1 amp. The voltage across Rpot is 1 * 2 = 2V, and the voltage across Rspeaker is 1*8 = 8V. So there's more current flowing through the circuit, and a greater voltage drop across the speaker, giving you a louder signal.

The basic mechanism by which the volume knob works is that it regulates the amount of current flowing to the speaker. The greater the current, the louder the signal.

I hope this was helpful.
Yeah.

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