PHYS 3 Chapter Notes - Chapter 26.3-26.4: Rc Circuit, Ammeter, Ohmmeter
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23. 3 electrical measuring instruments: d"arsonval galvanometer = a device that measures potential difference (voltage), current, or resistance to these points any current from the source. 26. 4 r-c circuits currents that are larger than its full-scale reading: voltmeter = a voltage-measuring device, ammeter = a current-measuring instrument. Always measures the current passing through it. An ideal ammeter would have zero resistance: ohmmeter = an alternative method for measuring resistance. Consists of a meter, a resistor, and a source connected in series: potentiometer = an instrument that can be used to measure the emf of a source without drawing. Measures the potential difference between two points, and its terminals must be connected. Shunt resistor ( ) = a resistor placed in parallel with a measuring device to measure. Equation 26. 7: is the full-scale current of a meter, is the coil resistance of a meter, is the full-scale reading of an ammeter, is the shunt resistance.
