00:02Hi friends, the more you don't know, the more opportunities you have to learn.
00:09Several batteries are connected in series.
00:12The circuit is then connected to a resistor.
00:17Now, we're asked to calculate how much current flows through the circuit.
00:27As a visual illustration, watch the short animation below.
00:32Each battery has an internal resistance.
00:36We can represent these batteries with a resistor symbol.
00:43There are 12 batteries connected in series.
00:47This isn't practical, how about we simply represent all of these batteries with their
00:52left and right ends.
00:57Next, these batteries are connected to a resistor.
01:03To identify them, the voltage of each battery is epsilon, the internal resistance of each
01:08battery is R, and the resistance of the resistor is big R.
01:15Once all the circuits are connected, electric current will flow.
01:22We can use Kirchhoff's voltage law to find the current value.
01:29Since this circuit is quite simple, we'll stick to simple logic.
01:35Voltage is a scalar quantity, and the total voltage is the number of batteries multiplied
01:40by epsilon.
01:42N here represents the number of batteries.
01:47All resistors are connected in series.
01:51The equivalent resistance is NR plus big R.
01:54Since the number of internal resistances is N, we can then apply Ohm's law.
02:03The total voltage is R-equivalent multiplied by the current.
02:09From here, I is equal to the total epsilon, divided by R-equivalent.
02:17At this point, we only need to check a few values listed on the worksheet.
02:24A little math, I is about 0.1125 Ampere.
02:30Happy learning, everyone!
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