Brain Teaser Challenge - "October"†

by Butch Shadwell
When I got started in this business we used multi-meters with a d'Arsonval meter movement that was powered by the signal that was being measured. Of course the voltage that one read from the meter needle movement could be off a bit depending on the source impedance of the signal. They used to rate the meters input resistance in ohms per volt. Some would be 10,000 ohms/v or even higher sometimes.

If I had a multimeter rated at 1000 ohms per volt, set on the 10 volt range, what voltage would I read from the dial if I measured the voltage at the middle node of a voltage divider composed of two 10,000 ohm resistors in series, across a solid 5 volt DC supply? Later I bought a VTVM or vacuum tube volt meter, with a fixed input resistance of 11 megaohms.

Reply to Butch Shadwell
904-223-4510 (fax)
904-223-4465 (v)
3308 Queen Palm Dr.
Jacksonville, FL 32250-2328.
www.shadtechserv.com

The names of correct respondents may be mentioned in the solution column. 

† Our friend Butch volunteers a bit too much, he never quite catches up to the current month.

October 2009 ExCom Minutes

October Minutes

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September ExCom Minutes

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