# Battery Charging

In order to charge a battery there must be a potential difference between the charger and the battery, i.e.a charging voltage. As a battery is being charged this potential difference reduces and since the charging current is related to this charging voltage the rate of charging also reduces.

A battery is put on charge.The relationship between the charging current,i amperes, and the time, t hours passed,is given by this formula, i=3e to the power of-0.36t (cannot type in proper inequality symbols).

Q1: Construct a table showing the current for values of time between 0 and 9 hours at intervals of 1 hour. Hence draw a graph of i against t for 0 is smaller or equal to t is smaller or equal 9 (cannot type in proper inequality symbols).

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#### Solution Preview

Please see the attached xls file, which can be opened by MicroSoft Excel. In case you don't know how to open it, I copied the table at the end. You may only need the first and final columns.

Notes:

1. e = 2.7183 (approximately)

2. "i=3e to the power ...

#### Solution Summary

The solution constructs a table showing the current for values of time between 0 and 9 hours at intervals of 1 hour.