Building a Mass Balance to Measure Small Weights Using a Rotary Potentiometer
Introduction:
Nowadays, we have mass balances, weighing scales etc to measure masses
but we hardly have devices that measure small masses. Sometimes, we
may have to measure objects with small masses say 10g to 100g and my
model is created backed up with this idea.
Components Used: Digital multi-meter, Meter rule, Retort Stand, Clamp,
Rotary potentiometer, Power supply (5V), Spring, Masses (in unit of
10g), 2k and 3k resistors, 1k variable resistor, amplifier.
Reason For Choice Of Components:
· Rotary Potentiometer: I used a rotary potentiometer so that when
masses are placed on the meter rule the change in voltage (output)
could be noted. The rotary potentiometer is of 5k Ohms but I connected
it to a 5V power supply as a more convenient way of measure. As the
potentiometer moves the resistance changes and also does the voltage.
· 2k, 3k Fixed Resistor and 1k Variable Resistor: I used these
resistors in order to make a Wheatstone Bridge so that there will be a
significant change in output when masses are added to the meter rule.
· Amplifier: I am using the amplifier in order to make my model more
sensitive and obtain a more accurate result.
· Spring: Without the spring, when masses a put on the meter rule, the
masses will pull the rule till the masses came to rest on a flat
surface. Therefore I am using a spring to stop this from happening
i.e. when masses are added the meter rule does not topple over and
reading could be efficiently and accurately taken.
Resources Used: I read up about the use of rotary potentiometer from
the AS Physics text book and also research about the significance of
the Wheatstone Bridge coupled with help from my Physics teacher.
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SETUP DIAGRAM
[IMAGE]CIRCUIT DIAGRAM
PROCEDURE:
I connected one end of the rotary potentiometer to a 0V terminal of a
power supply and the other end to a 5V power supply.
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Why is this the most appropriate instrument? (Be sure to include appropriate reference to source materials.)
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