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Sagot :

Explanation:

Primary cell    

1. They are non-rechargeable.

2. The energy density of primary cells is more.

3. The internal resistance of primary cells is more.

4. Example : Zinc-Carbon cell.

Secondary cells

1. They are rechargeable cells.

2. The energy density of secondary cells is less.

3. The internal resistance of secondary cells is less.

4. Example : Car batteries

Current :

The flow of electric charge per unit time is called electric current. It can be given by the formula as follows :

[tex]I=\dfrac{q}{t}[/tex]

The SI unit of electric current is Ampere.

1 Ampere is defined as the current that flows with the electric charge of one Coulomb per second (C/s).

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