1 00:23:33,780 --> 00:23:34,440 Hello again. 2 00:23:34,440 --> 00:23:38,780 In this video, we're going to talk about tidal energy and wave energy. 3 00:23:39,020 --> 00:23:41,420 Don't get this comfused with hydro because it is not hydro. 4 00:23:41,420 --> 00:23:47,300 Hydro is where you store water and allow it to fall turn turbines. 5 00:23:47,300 --> 00:23:51,660 Tidal energy is given its energy 6 00:23:52,140 --> 00:23:54,920 the courtesy of the gravitational attraction of the Moon and the Sun. 7 00:23:55,380 --> 00:23:57,960 Now, the moon and the Sun 8 00:23:57,960 --> 00:24:00,560 exert a gravitational attraction on our ocean. 9 00:24:01,620 --> 00:24:05,380 Now, contrary to popular belief, the tides don't run around the planet. 10 00:24:05,780 --> 00:24:08,760 The planet actually turns underneath the bulge of the water. 11 00:24:08,760 --> 00:24:12,960 Which is actually slowing down the spin of the Earth to a small degree. 12 00:24:13,020 --> 00:24:14,940 But we'll leave that for a different video. 13 00:24:14,940 --> 00:24:19,440 Now, if you imagine you have a barrier 14 00:24:19,860 --> 00:24:22,520 across a river, a tidal river, 15 00:24:23,040 --> 00:24:25,860 a river that rises with the fall 16 00:24:26,040 --> 00:24:28,440 and rise of the tide, the ebb and the flow. 17 00:24:29,120 --> 00:24:32,200 If you put a barrage across that with turbines in it 18 00:24:33,200 --> 00:24:35,000 as that water rushes through 19 00:24:35,000 --> 00:24:40,460 that barrage, you can get that to turn turbines without having 20 00:24:40,460 --> 00:24:44,540 to have a hand in moving water because it's doing all of itself anyway. 21 00:24:45,300 --> 00:24:47,780 Again, it would appear to be free energy. 22 00:24:47,800 --> 00:24:49,580 No, it's not free. 23 00:24:49,580 --> 00:24:51,540 You don't get free energy. 24 00:24:51,540 --> 00:24:53,960 Don't mix that either with wave energy. 25 00:24:54,200 --> 00:24:56,480 Now, wave energy is a totally different thing 26 00:24:56,480 --> 00:25:00,920 to tidal energy, whereas tidal energy is the movement of a body of water. 27 00:25:01,260 --> 00:25:07,200 Wave energy is the actual movement of a wave form up and down in water. 28 00:25:07,420 --> 00:25:12,740 Now where you have movement, you have the ability to harvest 29 00:25:12,740 --> 00:25:16,680 that and turn that movement into energy. 30 00:25:16,680 --> 00:25:21,440 So you're taking kinetic energy and you are turning it into electrical energy. 31 00:25:21,880 --> 00:25:26,360 So imagine you have a magnet and it goes up and down 32 00:25:26,640 --> 00:25:28,700 against a conductor 33 00:25:29,400 --> 00:25:31,920 that will produce electricity 34 00:25:32,000 --> 00:25:36,160 that will give a charge in the wire. 35 00:25:36,160 --> 00:25:40,980 So we all know, at sea, the swell of the sea up and down. 36 00:25:41,400 --> 00:25:43,560 That is wave energy. 37 00:25:43,560 --> 00:25:45,600 Again, it's free. 38 00:25:45,680 --> 00:25:48,440 All you've got to do is go and find it and harvest it. 39 00:25:48,680 --> 00:25:50,540 It's there to be taken. 40 00:25:50,540 --> 00:25:54,840 Now this is an energy production technology that is in its infancy. 41 00:25:55,580 --> 00:25:58,220 We are starting to understand how we can 42 00:25:58,720 --> 00:26:01,720 harvest that energy, in the most efficient way. 43 00:26:01,720 --> 00:26:04,800 Now, obviously, with tidal, that's very easy. 44 00:26:05,160 --> 00:26:08,280 It is very similar to using the water 45 00:26:08,280 --> 00:26:11,440 held behind a dam, letting it flow through your turbines. 46 00:26:11,700 --> 00:26:15,640 Now the joy of tidal is in the morning. 47 00:26:16,700 --> 00:26:18,260 It will go that way. 48 00:26:18,780 --> 00:26:22,160 All you have to do is tilt the blades of your turbine. 49 00:26:22,200 --> 00:26:25,520 The opposite direction when the tide goes out spins them again. 50 00:26:25,520 --> 00:26:27,900 Win win. Have you got to touch anything? 51 00:26:27,900 --> 00:26:29,920 No. have you got to power anything? No, you don't. 52 00:26:29,940 --> 00:26:34,440 All you've got to do is make sure the pathways through those turbines are clear. 53 00:26:34,500 --> 00:26:38,300 That's one of the biggest problems with tidal energy, because where you have 54 00:26:38,300 --> 00:26:41,560 tidal flow, you get massive amounts of sediment movement. 55 00:26:41,580 --> 00:26:44,160 That is why it's not suitable for the Humber. 56 00:26:44,160 --> 00:26:47,340 Inside the Humber there are massive, massive amounts of sediment. 57 00:26:47,780 --> 00:26:51,120 The Humber actually is a compliments of four rivers, 58 00:26:51,120 --> 00:26:54,240 three or four rivers whichever way you look at it, it's an estuary. 59 00:26:54,780 --> 00:27:00,260 Unfortunately, the silt carried down would bog down a tidal barrier. 60 00:27:00,440 --> 00:27:06,300 But there are tidal barriers further up the rivers where it can be harvested. 61 00:27:06,300 --> 00:27:08,720 Again, wave energy. 62 00:27:09,020 --> 00:27:12,860 The best place to go and find those big waves quite a long way out offshore. 63 00:27:13,220 --> 00:27:15,100 The shallower the sea. 64 00:27:15,100 --> 00:27:18,980 If you get a big swell in the deep ocean as it comes into a shallower sea 65 00:27:18,980 --> 00:27:20,440 around the top of the North of Scotland 66 00:27:20,440 --> 00:27:22,880 into the North Sea, it's just one of those things. 67 00:27:22,980 --> 00:27:26,720 As it reaches shallow water, the actual waves themselves grow. 68 00:27:27,480 --> 00:27:30,440 Therefore, you can harvest that energy easier. 69 00:27:31,040 --> 00:27:32,600 If you actually go to Scotland 70 00:27:32,600 --> 00:27:36,940 or go on to YouTube and have a look, you will see those wave 71 00:27:38,380 --> 00:27:39,960 energy collecting devices. 72 00:27:39,960 --> 00:27:42,980 They are being worked on now, and they are starting 73 00:27:42,980 --> 00:27:46,020 to bring it into a form where it is usable. 74 00:27:46,740 --> 00:27:48,500 In the next set of videos. 75 00:27:48,500 --> 00:27:51,640 We're going to have a look at the ways we use our planet again, 76 00:27:51,640 --> 00:27:52,640 but in a different way. 77 00:27:52,640 --> 00:27:57,740 So tidal and wave, all free, the next one's 78 00:27:59,240 --> 00:28:00,100 icing on the cake.