00:00Hi friends, a never-ending adventure is a learning adventure, because every day there's something new to learn.
00:07We often see dry-cell batteries in stores.
00:13Batteries are electronic devices, and they certainly have an electrical resistance value.
00:20In this series, we'll calculate the internal resistance of a battery.
00:26A glance at the problem sheet shows the battery voltage, the resistor resistance, and the electric current flowing through the circuit.
00:36Without further ado, let's get into it.
00:39This is a simple circuit consisting of a battery and a resistor.
00:46A battery also contains electrical resistance.
00:51This electrical resistance is known as the internal resistance of the battery.
00:56This resistance value is often symbolized by a lowercase letter R.
01:01The arrangement shows that the electrical resistance of the resistor and the internal resistance of the battery are connected in series.
01:11Therefore, the equivalent resistance in this circuit is big R plus small R.
01:20Using Ohm's law, epsilon is equal to I times big R plus small R.
01:26Now, let's look at the problem sheet once again.
01:30Epsilon is the battery voltage, 3 volts.
01:36Big R is the resistance of the resistor, 12 ohms.
01:42I is the electric current, 0.2 amperes.
01:47This seems like a simple calculation.
01:50Divide 3 by 0.2.
01:54From here, small R is equal to 3 ohms.
01:59It turns out the battery has an internal resistance value.
02:05Happy learning, everyone!
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