Using the given materials, can you build a device to measure voltage in two rang
ID: 1874504 • Letter: U
Question
Using the given materials, can you build a device to measure voltage in two ranges? 0-3 volts and 0-10 volts?
Using the given materials, can you build a device to measure voltage in two ranges? 0-3 volts and 0-10 volts?
Topic: Design a Voltmeter using Ohm's Law circuit properties Big Question(s): 1. Using a Galvanometer and a set of resistors, can I build a device to measure voltages in two ranges: a. 0-3 volts b. 0-10 volts-Rm would be different . Research: . Describe what a galvanometer is, how it works, and what it can be .Describe how a galvanometer and a resistor(s) can be combined to o Determine the internal resistance of a galvanometer used for. spring hs create a voltmeter. o Determine the current sensitivity of a galvanometer Materials available to you: 2 Decade Resistance boxes . Multimeter for validating the resistance from the Decade box . Galvanometer . wires or Scope: o Build a voltmeter capable of detecting voltage in 2 different ranges TCLUDE DIAGRAMS OF YOUR CIRCUITS
Explanation / Answer
1. using a galvano meter one can measure voltages in two ranges by using a shunt resistance in series
in this case, the whole voltage drop happens across the shunt and the galvanometer deflection when scaled gives us the output voltage
Rs ( shunt resistance will be different for the two cases)
2. galvanometer is an instrument that shows deflection when current passes through it. it us very sensitive and works with very small values of currents. hence a galvanometer can be used to measure voltages and currents by using appropriate resistances in parallel or series with it, as required by the experiment
to create a voltmeter, we need to draw very little current from the circuit and ir is connected across two points on the circuit
hence
we need to have high resistance in series with the galvanometer so that all the voltage drop happens across this series resistnace and ht egalvanometer readin when scaled accordingly gives us the voltage reading
internal resistance of galvanometer is the resitance of the coil of the galvanometer ( and not the shunt resistor)
current senstivity = current required for unit deflection in galvanometer
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