00:02
Okay, so i've got a number of light bulbs listed in the table here, current and resistance for the first light bulb.
00:08
And it says here that we've got five bulbs that we're going to be adding in series.
00:12
We do that one by one until they're all wired in the series, and we want to know the current and the resistance.
00:17
So if each bulb has a resistance of r, we're going to basically add r every time.
00:22
So two bulbs would be 2r, 3 bulbs would be 3r, 4 bulbs would be 4r, and 5 bulbs would be 5 r.
00:30
To find the current, we're going to use the equation voltage is equal to current times resistance.
00:37
And if we solve this for i, we're going to be doing v divided by r is equal to i.
00:44
So if i is the first current, in other words, if this is my first current, for my second current, what i'm going to do is use 2r instead.
00:56
So i'm going to plug a 2 in there, and that's going to give me half the current.
01:01
Current...