Easy to understand the concepts. I love your videos. However, if you could sort your videos into playlists of each topic it would be much easier to navigate around.
Thanks Osama, The videos are in playlists. The link for the playlist that this video is included in is below,ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-0iQxlRessAs.html
for the last question if the voltage were different and you used the equation P= (V^2)/R and solved for R you would not get the same resistance, does this mean that the resistance of the light bulb changes as voltage changes?
If we change the voltage, the power would change. The resistance would change as well for a lightbulb. Effectively, devices do not function properly without the rated voltage, and that means that they do not consume the same amount of power.
Hi for 18:57 was wondering that V given is 110 V but thats not RMS. Why haven't u divided this by root 2 before using this value. Same for power.... why hasnt it been 1/2ed for average?
In a.c. we give rms values. In doing so we can use the same equations as we do for d.c. i.e. P=VxI etc. 110V is rms by default, we would need to specify that an a.c. voltage was a peak value if we that is what we wanted to communicate.
At 4:40, what does it mean for the lines to pass another side of the area, why is this important? In the first situation, 12 field lines pass through the area, and after 12 field lines pass through the area. In the second situation,3 field lines pass through the area, and after 3 field lines pass through the area. I do not get the difference.
Good question. Notice how I emphasized that the lines pass from below the coil, and then from above the coil in situation B That is, there is a large change in the flux since it passes through in the opposite direction. It is like if you run to the right at 3 m/s and then you run to the left at 3 m/s, there is a large change in velocity even though there is not change in speed.
It would be equal to 1/2( Ipeak Vpeak), which is equal to (Irms Vrms). Like Chris said, the rms values are really just the dc equivalent for ac generators, which means we can use them in the dc equations.
The d.c. current is constant. The idea of rms values is so that we can use the form of our d.c. equations for a.c. circuitry, in particular for the power equations.
18:00 wouldn't the voltage across every bulb be different, how can we use the same voltage for every bulb? It's connected in series so wouldn't there be a voltage drop?
