t7-microphones

Question 1

which effect do loudspeakers use

Answer 1

motor effect

Question 2

which effect do microphones use

Answer 2

generator effect

Question 3

3 stages of microphones

Answer 3

1.coil of wire is attached to a diaphragm. the end of the coil sits over a permanent magnet
2.when sound waves hit the diaphragm they cause it to vibrate
3.coil of wire moves in and out through the magnetic field which induces a PD on the ends of the wire

Question 4

5 stages of loudspeakers

Answer 4

1.a cone has a coil of wire, which has a permanent magnet inside is wrapped around one end, which is connected to AC current supply
2.as current passes through the coil it generates a magnetic field
3.magnetic field from coil interacts with field from permanent magnet
4.fields attract/repel producing a resultant force
5.when current switches direction, direction of the force on the cone reverses which causes the cone to move in and out, generating sound waves