A car battery has ___ resistance than a dry cell.
The internal resistance of car battery and dry cell.
1. Inside the battery, current flows from the negative terminal to the positive terminal. So during this flow of current electrochemical factors (such as electrolyte conductivity, ion mobility, and electrode surface area) provide resistance to current.
2. This resistance knows as the internal resistance of the battery.
3. A normal dry cell is usually rated at (terminal voltage ) and ) whereas a car battery is rated at (terminal voltage ) and .
4. Now using Ohm's law the internal resistance of the car's battery and dry cell can be calculated as where emf of cell Terminal Voltage and Current in the circuit.
The internal resistance of the car's battery
Similarly for dry cell
Here we can see . i.e. Internal resistance of the car's battery is much smaller than the resistance of the dry cell.
5. An enormous current of about can only be generated when internal resistance is much lower.
6. A dry cell has an electrolyte in form of a paste that resists the flow of ions present.
7. The car battery generally consists of an electrolyte solution that is made up of water and sulphuric acid which makes ions flow easily leading to low resistance.
8. Internal resistance is a characteristic of the battery.
Hence, a car battery has much lower resistance than a dry cell.