00:02Hi friends, it's okay to take a break from studying, as long as you don't stop learning.
00:09Similar to the previous video series, this time several batteries are connected in parallel.
00:15Next, the circuit is connected with a resistor.
00:20Now, we're asked to calculate how much electric current flows.
00:29Here's a battery.
00:32Inside the battery is an internal resistance.
00:37There are 12 batteries arranged in parallel.
00:43I don't think this illustration is effective.
00:47What if this arrangement were represented by the top battery and the bottom battery?
00:55Next, the batteries are connected with a resistor.
01:01Of course, electric current will flow from the positive terminal of the battery to the negative terminal.
01:08This electric current is what we want to calculate.
01:14To identify, let's assume the voltage of the battery is epsilon, the internal resistance is R, and the resistance of
01:21the resistor is big R.
01:27Note the connection point near the battery.
01:32If we measure the voltage at both points, the voltage is nothing less than epsilon.
01:40So, the total voltage is epsilon.
01:42So, the total voltage is epsilon.
01:45For internal resistance, all the internal resistances are connected in parallel.
01:51We can represent all these resistances with a single value.
01:561 over a total is equal to 1 over N R.
02:02From here, our total is equal to R over N.
02:08Now the internal resistance is connected in series with a resistor.
02:16These two resistance values can be represented by R equivalent equals big R plus R over N.
02:24This circuit now looks simpler.
02:29Based on Ohm's law, epsilon total is equal to I R equivalent.
02:36From this, we can find the value of the electric current.
02:42Now we can see some values on the problem sheet.
02:47If I'm not mistaken, I is around 0.015 Amperes.
02:53It turns out that this value is much smaller than the electric current in video number 20.
03:00Batteries connected in series can provide a greater current value than if the batteries were connected in parallel.
03:08Happy learning, everyone!
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