Demonstration of Ohms’ Law by theory & Practical. How to Measure Resistance, How to Measure Voltage & Current and approve the equation of Ohm’s Law by Practical. Lab Manual/Lab Report is also given below. If you have any question feel free to ask by comment below.
Ohm’s Law Experiment Video:
Ohm’s Law Experiment Lab Report:
Electronics Lab: Verification of Ohm’s Law Experiment
- Power supply
- Connecting wires
Ohm’s law which state that the voltage drop through a resistor is proportional to the current flowing through the resistor. OR
Current through the resistance is proportional to the applied voltage and inversely proportional to the resistance under constant temperature.
For dc electric circuits, the relationship between voltage current and resistance is expressed in a simple but very value able law, known as ohm’s law. This law states that current I in amperes flowing through a resistance r is equal to the potential difference v, expressed in volts across the resistance r divided by r expressed in ohms
The current I can be increased by either increasing v or decreasing r. likewise the current I can decreased by decreasing V or increasing R. Also note that although 1 and v are directly proportional to each other, current I is inversely proportional to R.
COMBINING (1) AND (2), WE GET
Equation 3 Is Mathematical Definition of Ohm Law
For metals carbon and some alloys, V/I or r is constant for any value of v if their temperature remains constant. Conductors that obey ohm’s law are called ohmic or linear conductor, i.e. their v-I graph is linear. Conductors that don’t obey ohm law are called non-ohmic or non-linear conductor i.e. their v-I graph is curved.
- Select the resistor and measure the value with the help of ohmmeter and color codes.
- Calculate the error in measurement
- Patch up the circuit according to the circuit diagram
- Measure and write down the applied voltage by connecting voltmeter across power supply
- Measure and write down the current following through the circuit by connecting ammeter in series.
- Vary voltage from the power supply, repeat step 3 and 4 and fill up the observation table.
- Compare the calculated and measured value find out error if any also write reasons of error
- Draw graph between measured values of current and applied voltage
- Patch up the circuit according to your diagram
- Before switching on power supply show your circuit to your instructor.