NCERT Book Class 8 Science Chapter 11 Chemical Effects of Electric Current

CHEMICAL EFFECTS OF
ELECTRIC CURRENT

Y
our elders might have cautioned plastic and wood do not conduct
you against touching an electrical electricity. However, so far we have used
appliance with wet hands. But our tester to test materials which were
do you know why it is dangerous to in solid state. But what about liquids?
touch an electrical appliance with wet Do liquids also conduct electricity? Let
hands? us find out.
We have learnt earlier that the
materials, which allow electric current
to pass through them, are good Paheli and Boojho want to
conductors of electricity. On the other remind you that one
hand, materials, which do not allow should not experiment
electric current to pass through them with the electric supply
easily, are poor conductors of electricity. from the mains or a
In Class VI, we made a tester to test generator or an inverter.
whether a particular material allows the Use only electric cells for
electric current to pass through it or not. all the activities suggested
here.
Do you recall how the tester helped us
in deciding that?
We found that metals such as copper 11.1 Do Liquids Conduct
and aluminium conduct electricity Electricity?
whereas materials such as rubber,
To test whether a liquid allows electric
current to pass through it or not, we
can use the same tester (Fig.11.1).

Fig.11.1 : A tester