Question

In: Electrical Engineering

Battery capacity is sometimes given in units of Amp-Hr. If a 9 volt battery has a...

Battery capacity is sometimes given in units of Amp-Hr. If a 9 volt battery has a capacity of 500 milliAmps-hr's, how long would it take for each resistive circuit to discharge the whole 9V battery? Hint: 500 mAmps-hr essentially means it can maintain a 500 mAmp discharge from 1 hour only.

Solutions

Expert Solution

If Resistive Circuit have RESISTANCE R than to discharge Whole 9Volt depend on Resistance . As we know relationship between V , I and R

V = IR  

Battery Capacity = Current × Time

So Current I = V/R

And time Taken is T(Hour) for discharging the whole 9 V battery than

(V/R)×T = 500mA- Hour

So T = [(500mA -Hour)×R] /V

If we Have R(Kohm) we will get the Time (T) hour .


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