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C.  Conduction of Electric Current using a Tester:

                     Join the free ends of the tester together for a moment, so that it completes the circuit
                       of the tester and the bulb should glow.

                     However, if the bulb does not glow, it means that the tester is not working.

                     Check  that  all  the  connections  are  tight.  If  they  are,  then  replace  the  bulb  with

                       another bulb. If it is still not working then replace the cells with fresh cells.

                     Now that our tester is working, we can use it to test the various liquids for conduction
                       of electric current.


































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