Write the activity 12.1

Activity 12.1 asks us to correlate voltage and current across a resistance using a different number of batteries. Observation: On increasing the number of batteries, the potential difference, as well as the current across the resistance, increases proportionally. Explanation: When we increase the number of batteries across a resistance, we increase the potential difference across the resistance. Potential difference is directly proportioned to the current flowing through it. As a result, we see an increase in the reading of ammeter as well as that of the voltmeter. Consider Potential difference as pressure on water and current as a flow of water. If we increase the pressure, it will result in an increase in the flow of water. The same thing happens with the current also. We call this as Ohm’s law. Ohm’s law state that at a fixed temperature the voltage across the resistance is directly proportional to the current flowing through it. V∝I when Temperature and resistance are constant. i.e. V=IR Conclusion: On increasing the potential difference across a resistance we see an increase in the current, it proves that V∝I i.e. Ohm’s law. Calculation: experiment to demonstrate ohm's law On an increase in voltage, current across the resistance also increases