Unit Conversion

**pychon** · September 9th 2010, 05:29 PM

Have a couple problems I'd like to ask to check...

Given the following, solve for E:
I=2.00 A,
R=28.0 V/A,
r=0.500 V/A

$I=\frac{E}{R+r}$

Work done.

$\frac{R+r}{1}\cdot I=\frac{E}{R+r}\cdot\frac{R+r}{1}$

$R+r\cdot I = E$

Answer: 28 V; believe I did something incorrectly.

**skeeter** · September 9th 2010, 05:32 PM

Originally Posted by pychon

Have a couple problems I'd like to ask to check...

Given the following, solve for E:
I=2.00 A,
R=28.0 V/A,
r=0.500 V/A

$I=\frac{E}{R+r}$

Work done.

$\frac{R+r}{1}\cdot I=\frac{E}{R+r}\cdot\frac{R+r}{1}$

$R+r\cdot I = E$

Answer: 28 V; believe I did something incorrectly.

$E = I(R+r)$

**pychon** · September 9th 2010, 05:39 PM

Thanks, those orders get me

**pychon** · September 9th 2010, 05:48 PM

Another...

$A=\frac{1}{2}(a+b)h$

correct?

$h=\frac{2A}{a-b}$

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