Re: HELP!! Need answers for test!!!

[Frank Olson <Use_the_email_links@xxxxxxxxxxxxxxxxxxxxxx>]

Robertm wrote:
> "Frank Olson" <Use_the_email_links@xxxxxxxxxxxxxxxxxxxxxx> wrote in message
> news:YVGmf.86520$Gd6.37113@xxxxxxxxxxx
>
>>petem wrote:
>>
>>>I do not agree and this link will say the same
>>>
>>>http://www.answers.com/topic/resistor
>>>
>>>a resistor is limiting current not voltage
>>
>>
>>They're wrong.  A resistor drops voltage and is a voltage limiting device.
>>If you (for instance) use a variable resistor to control the speed of a
>>fan (or light), the current remains the same regardless of the setting.
>>The only thing you're doing is reducing the voltage to the load.
>
>
> We are also reducing the current if the resistance of the load remains
> fixed. A lamp and fan would be more difficult to calculate because impedance
> enters into fan calculations, and lamp resistance changes dependent on
> element temperature which is dependent on applied voltage and subsequent
> current. If we were to assume a resistive load of 12 ohms across a 12 volt
> supply, we have one amp flowing. Add a 12 ohm resistor in series with the
> load and we now have 6 volts across the limiting resistor and 6 volts across
> the load giving us a current of 500 ma through the load.

What???  Current in a series circuit stays the same.  Halving the
voltage through the load in the series circuit you describe above
doesn't reduce the amount of current drawn from the source.  Where did
you go to skool??