Question

1.Give an advantage and a disadvantage of a parallel combination. Give an example.

2.Give a few essential features of an ordinary cell.

3.How should two identical batteries be connected in order to obtain the maximum EMF from the combination, should it be in series or parallel? Why?

?
4.How does the resistance of a conductor affected by its length and diameter?

Answer 1

1. Advantage: Consistent voltage can be applied across connected devices.

Disadvantage: Parallel circuit requires lots of wire to fabricate.

2.

• An Ordinary cell should have a consistent voltage across it for a long streach of time.
• The internal resistace of the cell should be zero or very little.
• The voltage across it should be temperature independent.

3.

They should be in series to achive maximum emf. As the batteries are like an "pump" for electron, so two of those connected in series can "push" electrons with double "pressure".

4.

According the laws of resistivity,

so, , L is length and D is diameter.