Question

A 12V battery with 0.3 ohm internal resistance is connected to a 24V voltage source charging it.What is the power delivered by the voltage source?

Answer 1

-2880 Watts

Explanation

Step 1

Let

$\begin{gathered} V=24V \\ Internal\text{ resistance of battery=}0.3\Omega \\ \end{gathered}$

Now, we need aplly the formula

$I(current\text{ in circuit)=}\frac{e.m.f}{\text{total resistance}}=\frac{24\text{v}}{0.3\Omega}=80\text{ Ampers}$

Step 2

now, we need to find the powe delivered, to do that, let's use this formula:

The power delivered by the voltage source is: PV = – I * V =

$\begin{gathered} P=-I\cdot V \\ P=-80\text{ A}\cdot(36)V \\ P=-2880\text{W} \end{gathered}$

hence the answer is -2880 Watt

I hope this helps you

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