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- Thread starter jinyong
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- #2

berkeman

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For a good voltage source, the output voltage is very stiff (doesn't change much) as the output current changes, so

[tex]Z = \frac{dv}{di} = \frac{0}{di} = 0[/tex]

But for a good current source, you get very little change in the output current over a wide range of output voltages, so

[tex]Z = \frac{dv}{di} = \frac{dv}{0} = infinity[/tex]

EDIT -- okay, I give up. How do you make the little infinity symbol in LaTex? "\inf" didn't work.

- #3

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Berkman is correct.

Voltage source can provide infinite amount of current. And a current source can provide an infinite amount of voltage.

Z = V/I

infty

[tex] \infty [/tex]

Voltage source can provide infinite amount of current. And a current source can provide an infinite amount of voltage.

Z = V/I

infty

[tex] \infty [/tex]

Last edited:

- #4

berkeman

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infty

[tex] \infty [/tex]

Thanks waht!

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