Wednesday, January 18, 2012

Oscilloscope input resistance problem in physics?

The input impedance of the oscilloscopes we use is 1 MegaOhm. Suppose you use your oscilloscope to measure the voltage across one of the resistors in a voltage divider (see figure), where R1=R2=700 kiloohm.. If you measure 1 V, what voltage would appear across the resistor with the oscilloscope disconnected?

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