Hello everyone,
This is probably a very elementary problem I've encountered. In Chapter 8, part 3 (Voltmeter impact on measured circuit, http://www.allaboutcircuits.com/vol_1/chpt_8/3.html ), I'm confused about how the potentiometric voltmeter employs Kirchhoff's Voltage Law. The text states,
"Likewise, the null detector simply indicates when the voltage between points 1 and 2 are equal, which (according to Kirchhoff's Voltage Law) will be when the adjustable voltage source (the battery symbol with a diagonal arrow going through it) is precisely equal in voltage to the drop across R2."
How does KVL apply here? The definition only states equality to zero of the algebraic sum of voltages. Is the text speaking in terms of the loop 1-2-1, or what's the deal?
Thanks for your help!
This is probably a very elementary problem I've encountered. In Chapter 8, part 3 (Voltmeter impact on measured circuit, http://www.allaboutcircuits.com/vol_1/chpt_8/3.html ), I'm confused about how the potentiometric voltmeter employs Kirchhoff's Voltage Law. The text states,
"Likewise, the null detector simply indicates when the voltage between points 1 and 2 are equal, which (according to Kirchhoff's Voltage Law) will be when the adjustable voltage source (the battery symbol with a diagonal arrow going through it) is precisely equal in voltage to the drop across R2."
How does KVL apply here? The definition only states equality to zero of the algebraic sum of voltages. Is the text speaking in terms of the loop 1-2-1, or what's the deal?
Thanks for your help!