Materials that conduct current are called .
Materials that do not conduct current, which are the opposites of electrical conductors, are called .
The device for opening or closing an electric circuit is called a .
Which of the followings are not electrical conductors?
Wood.
Plastics.
Graphite.
Cotton.
When the switch in the circuit is pressed, the current flows in it.
The copper wire is not a conductor.
The bulb in the circuit changes chemical energy into light energy and heat energy.
Name the apparatus in the picture.