00:01
In this problem, we are given that there is a battery and the emf of this battery is 24 volts and its internal resistance.
00:11
This is given to us as 3 oms and this is connected across a resistor whose resistance is r.
00:22
And we are also given that the power that's consumed by this resistor is 21 watts.
00:33
So p is representing the power that's given as 21 watts and we are required to determine the values of r here.
00:45
So first we will be using this equation which is in accordance with omslaff, according to which the total voltage that's supplied in this circuit is equal to current times the total resistance, which is r plus 3.
01:01
And let's take the current in the circuit as i.
01:04
So this is the first equation.
01:06
And let's use this equation for the electrical power.
01:10
And we are given the power as 21 watts.
01:13
So this is equal to i squared times r.
01:17
And this is equation two.
01:20
So here we square equation one...