The capacity of a secondary cell is 30 A.h what is the meaning of this statement? How much electric charge would be available without damaging the cell?

The capacity of a secondary cell is 30 A.h what do you mean by the statement? How much electric charge can be drawn from if without damaging it?

Capacity of a secondary cell is 100 A - h. How much charge can be obtained from it?

What is a solar-cell, how much electricity it producess?

The Earth's surface has a negative surface charge density of 10^(-9)C//m^2 . The potential difference of 400kV between the top of the atmosphere and the surface, results (due to low conductivity of the lower atmosphere) in a current of only 1800 A over the entire globe. If there is no mechanism of sustaining atmospheric electric field, how much time (roughly) would be required to neutralise the Earth’s surface?

A point charge causes an electric flux of . -1.0 times10^3Nm^2//C to pass through a spherical Gaussian surface of 10.0 cm radius centered on the charge, ) If the radius of the Gaussian surface were doubled, how much Flux would pass through the surface ?

A few storage cells in series are to be charged from a 200 V dc supply. The emf of each cell is 2.5 V, Internal resistance 0.1 Omega and the charging current is 8A. In this arrangement how many cells can be charged and what extra resistance is required to be conncted in the circuit?