00:01
In this example, we're looking at a small circuit.
00:03
It consists of a battery or a voltage source and three resistors.
00:07
Okay, so we have our battery here that's 12 volts.
00:11
Okay, that's connected to resistor 1, r1 that has a value of 20 ohms.
00:18
Okay, connected to r2 with a value of 70 ohms, i believe.
00:26
Yep, 70 ohms.
00:27
Okay, and then finally we have resistor 3, r3 with a value of 20 ohms.
00:37
Okay, we're gonna ask a couple of questions here.
00:40
Our first question is, are these resistors in series or in parallel? they are in series.
00:49
Okay, two, we wanna find the equivalent resistance, okay, of this system.
00:54
We know four resistors in series are equivalent, equals r1 plus r2 plus r3 dot, dot, dot.
01:06
So my equivalent resistance is 20, 20, 70 is 110 ohms.
01:16
Okay, next we wanna find the current coming out of the battery.
01:20
Okay, we're gonna use ohm's law...