Question

a. In case of a fire , before the fireman use the water hoses they shut off the main electric supply for the area . Explain why they do these

b. It is safe for the electrician to carry out electrical repairs outdoor during heavy downpour ? explain .

c. The process that you show in activity 14.7 for purification of copper . A thin plate of pure Copper and thick rod of impure copper are used as electrodes .copper from the road is thought to be transferred to the thin copper plate . which electrode should be attached to the positive terminal of the battery and why ?

pls give me answer urgent

Answer 1

Ans. (a) The firemen do this because the water may conduct electricity if the electrical supply for the area is not shut off and water is poured over electrical appliances then, electricity may pass through water and harm the firemen.

Ans. (b) No, it is not safe to repair electrical appliances outdoors during heavy downpours. This is because rainwater contains dissolved salts and it can conduct electricity. The electrician may get electrical shocks.

Ans. (c) Copper ion is positively charged . It is attracted towards the plate
which is connected to negative terminal of the battery. As copper ions are transferred to the thin copper plate , this
thin copper plate must be connected to the negative terminal of the battery. Consequently, impure copper rod is connected to the positive terminal of the battery.


Hope this helps!!!!!