Paragraph on “How are Radio messages sent and received?” complete paragraph for Class 9, Class 10, Class 11 and Class 12

How are Radio messages sent and received?

The sender speaks into a microphone which converts the sound of his voice into an electric current. A transmitter first makes this current stronger then feeds it to an aerial which sends out radio waves. This aerial is a long wire, often as tall as a high building. When radio waves hit another aerial, like the one on your radio set, they are picked up and cause a small flow of electricity in the aerial. This electric current is made stronger, or ‘amplified’, by the receiver and fed to the loudspeaker or earphones. These change the current back into sound that we can hear.