Name: Abishek Ghalley
Roll no. 2k20/EC/11
EXPERIMENT No. 2
AIM:
To Verify of Ohm’s law
Vlab Specification:
Resistors(1-100kohms), voltmeters, ammeters, diodes and power source DC(0-30V).
THEORY:
The law states that the current through a conductor between two points is directly
proportional to the voltage across the two points. Such a conductor is characterized by its
‘Resistance’ – R measured in Ohms.
V=I×R
V is the Voltage in Volts across the conductor.
I is the current in Amperes through the conductor.
Voltage(V) is directly proportional to current i.e V=I×R.
Resistance(R) in inversely proportional to current(I) i.e I=V/R
For ohmic conductors the graph between V & I comes to be a straight line say a resistance
whether it is single, series or in parallel connection.
Non ohmic device is a device that does not obey Ohm's Law i.e. the resistance is not
constant, but changes in a way that depends on the voltage across it.The device is said to
be non-Ohmic. In this case the V versus I graph is not a straight line, but has some curvy
shape. Such devices do not have a constant value of resistance and the resistance is called
dynamic resistance because it is constantly changing.Examples of such devices are
Name: Abishek Ghalley
Roll no. 2k20/EC/11
tungsten
filament
OBSERVATIONS:
(bulb),
diode,thermistor
etc.
Name: Abishek Ghalley
Roll no. 2k20/EC/11
Name: Abishek Ghalley
Roll no. 2k20/EC/11
RESULTS:
We have verified Ohm’s law for different cases: single resistance,series,parallel and non
ohmic devices also analyze the corresponding graphs.
PRECAUTIONS:
●
All the electrical connections must be neat, tight and correct.
●
Voltmeter and Ammeter must be of proper range and connected properly.
●
The key should be inserted only while taking readings.