Ohm law, how much power do i need ?

0:00 Here's a quick brief description, believe me, brief about Ohm's Law

Here's a quick brief description, believe me, brief about Ohm's Law. Now, Ohm's Law is basically resistance and resistance as you know it's almost something getting in your way, alright? If you could walk say along a nice country lane with no one in your way then brilliant but if all of a sudden there's three or four people in your way then you have resistance. You've got to ask them to move out of the way. They've got to get out your way for you to move. If let's say they don't move out of your way and you've got to push them, and you have to physically push them, now there's a resistance. There's something stopping you. So the more difficult they are to get out of the way, the more you have to push them out of the way. This is the resistance. This is the basis of Ohm's Law. So for example here, 400 watt amplifier, the current. Here's the resistance, a 400 watt speaker.

0:54 8 ohms is the resistance

8 ohms is the resistance. Now then, you will not get 400 watts coming out of that speaker just because you've got a 400 watt amplifier. Because of the resistance, you will only get X amount of power. On this basis, you will only get 200 watts out of that speaker. So just because you've got a 400 watt amp doesn't mean to say you'll get 400 watts. You will only get 200 watts out of here. Right, now then, I will explain what I'm on about very shortly. Right, okay, here's your power. This is one guy pushing the wall, which is the resistance. Now the resistance here will always stay the same. And here's the speaker, and the guy's quite happy because he realizes the resistance is holding the power back. So he's quite happy, he's chugging along. Now all of a sudden we start having more power. Now that resistance is starting not to work so well.

2:20 NASA Ohm's Law tutorial, it will

Because we've got more power, but we've got the same speaker here. Same guy, and he's thinking, oh dear, I'm having loads of power pushing at me. And then all of a sudden, there's too much power, the resistance starts to break up, the resistance is still there, but because there's too much power, it can't hold back the power now, and this guy's thinking, oh jeepers. Until eventually... RIP the speaker, you've blown it. And these guys are thinking, well, you know, what's going on? And the guy is dead. In other words, the speaker has been blown. So that's really the principle, a sort of, in a daft way, behind Ohm's Law. Now if you type in Ohm's Law in your search bar, go to NASA Ohm's Law tutorial, it will explain it in greater detail, OK? So basically all we're on about here is Ohm's Law is the principle,

Behind something stopping power or electricity getting to something. I hope this has been a help. It is quite difficult to get this down to its very, very basics so hopefully everyone will be able to understand it. So I hope I've been a help and once again practice and enjoy. Nice one. Cheers.

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