# Question #200c2

##### 2 Answers

#### Answer:

#### Explanation:

The maximum value for

So

#### Answer:

#### Explanation:

Given: Power output of a battery

where

To find maximum power we differentiate with respect to current and set it equal to zero.

Now

Since it is

For the given values

.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-

***An important result in electrical engineering**.

Power transfer between a voltage source and an external load is maximum when the internal resistance of the voltage source matches resistance of the load.