Energy conversion plays a vital role in our daily life. One among such is a conversion of electrical energy. The list of example of electrical energy to sound energy is listed in this post.
- Electric bells in schools and colleges
- Cordless headphones
- Electric doorbells
- Radio system
- Electric guitar
- Lightning during rain
Detailed explanation on the example of electrical energy to sound energy
Some electric devices produce sound when it is turned on. The generation of sound in some devices may irritate the ears. A brief explanation of the above-listed example of electrical energy to sound energy is given in this section.
The loudspeakers are fitted with a motor called a voice coil. As the electric pulses flow across the voice coil, the diaphragm begins to vibrate. Immediately, the vibration turns into air, generating the sound. Thus electrical energy is converted into acoustic energy.
Electric bells in schools and colleges
The schools bell converts electrical energy into sound energy.
When the switch of the electric bell is triggered, electric charges flow across the electromagnets; thus, the electric energy is transformed as mechanical energy which makes the clapper to move. Thus, the bell rings as the clapper hits the bell transforming electrical to sound energy.
The earphone is a good example of electric energy to sound energy conversion as we hear the noise through the earphone is because of the conversion of electric energy to sound.
The earphone consists of a moving diaphragm; when we connect our earphones to electrical devices such as mobiles or walkman, the transducer covers the electric charges into an audio signal which hits the diaphragm producing the sound waves which we can hear in the earphones.
The most innovative acoustic devices are cordless headphones or earphones in modern technology. These devices use converted electrical charges as audio waves to generate sound in the headphone.
The cordless headphones also work similarly to earphones, but the difference is the cordless headphones are also fitted with batteries to store the electric charges. As the headphones are turned on, the accumulated electric charges are converted into an audio signal using the transducer, thus producing the sound.
Television is an audio-video device in which electrical energy is converted into both light and sound energy.
When the television is turned on, the current flows across the circuits of the television. The flow of current is nothing but electrical energy. This electrical energy vibrates across the coil back and forth. As the vibration increases, the sound generation also increases. Thus television is also an excellent example of electrical to sound energy.
A household device that produces sound due to electrical energy is the mixer used for grinding purposes.
When the mixer is turned on, the electrical energy is transferred to the blades, which helps them to rotate. The mechanical energy is then converted into sound as the rotation increases.
We hear the sound in the refrigerator when it is just turned on is quite normal. In this case, the flow of electrical energy in the refrigerator produces such sound. When the temperature control is running, the electrical charges flow across the refrigerant due to the sound’s thermal expansion.
The doorbells work on the principle of electromagnetism to convert electrical energy into sound energy.
The doorbells consist of batteries to store the charges. When a person press bell, the stored charges are converted into mechanical energy. This mechanical energy is then converted into sound energy.
The radio system is an excellent example of both conversion of electrical to sound and vice versa. Initially, the sound energy is transferred as electrical energy and reaches the broadcasting antenna as wave.
The radio catches the signal from the radio station when it is turned on. The signals are turned as electrical energy and help to vibrate the diaphragm. The vibration of the diaphragm is tuned to get desirable audio signals to hear the sound. Thus electrical energy is converted into sound energy in the radio.
An electric guitar uses electricity to generate sound from their strings. The strings are made to resonate when the electrical energy is applied to them, thus sound is produced in the guitar.
The electric guitar works on the principle of electromagnetic induction. Under the string, a device called pickups is fitted to generate electricity. The strings are partially magnetized by the magnets fitted inside the guitars. When the guitar is connected to the power supply, the electric energy flows through the pickup coils, and the strings act as dynamo when they move. Thus the pickups make the strings resonate and generate the sound.
Lightning during rain
During rain, we hear the thundering sound because of the lightning, which is due to the collision of clouds. Lightning carries a large number of electric charges in it. Hence lightning possesses electrical energy.
The electric charges generated during lightning spread out in the sky, causing the air to be heat up. When the heating up of air increases, the air begins to expand. Due to this expansion of air, shock waves are generated. The shock waves explode by creating a booming sound. Thus lightning is an excellent example of electrical energy to sound energy.