a couple of technical questions.

[ukcouple]

Hi everybody.. this may be wrong forum but I have a couple of technical questions which I can't get a reliable answer to in my local mall. So here goes on the chance that someone here might have a quick answer..

Question 1. I am about to buy a new TV with UHD 4k 3840 x 2160 resolution. I want to use it as my desktop computer monitor but my computer graphics card is only capable of 1920 x 1080. I will connect via HDMI. Will it work properly and give a decent output.?

Question 2. Is there any simple way to reduce the current to my water heater 3KW to avoid continually dropping the circuit breaker with about the same rating.?

thanks if anybody knows..

 

[jstar]

1. Is the HDMI of the graphics card compatible with 4K? 1080p can be displayed on the 4K of course, and many TVs even upscale (but with quality loss). My Samsung allows changing the resolution btw.

2. The 3KW is not current (which is in Ampère) but power, and lowering a device is not easy but that’s a detail. Assuming your breaker is 15 A (3000/230 would trip it); If the copper cables are thick enough (important!), you could change the breaker with a 20 A model. That would allow 4KW.

 

[ukcouple]

1. Is the HDMI of the graphics card compatible with 4K? 1080p can be displayed on the 4K of course, and many TVs even upscale (but with quality loss). My Samsung allows changing the resolution btw.

2. The 3KW is not current (which is in Ampère) but power, and lowering a device is not easy but that’s a detail. Assuming your breaker is 15 A (3000/230 would trip it); If the copper cables are thick enough (important!), you could change the breaker with a 20 A model. That would allow 4KW.

thanks..
1. I've checked the specs of my graphics card and it maxes out at 1920x1080 so there's no 4k output. i bought my computer about 5 years ago when 4k was not common so that's probably why.

anyway, it got me thinking do I really need a 4k tv.? There's no 4k broadcasts in Indonesia and even if there were my slow internet would struggle with it. I may just go with a regular "fullhd" tv.

2. I'll check out the possibility of increasing the rating of the circuit breaker but what about a resistor in the power supply to the water heater.? wouldn't that restrict the current .?

 

[jstar]

I guess something like a 26Ω resistor could do the trick yes. But it provides only 500W or so less to the water heater, the resistor ‘eats’ that. A simple potentiometer has normally a very small capacity and will become very hot, for that amount of Watt you’d need a bigger model with cooling. A dimmer might work since unlike the power supply of a PC or so, it’s a ‘stupid’ appliance but I wonder if the water will ever boil then?

First Media does offer 4K. But the question is how many channels will become available...
https://www.firstmedia.com/get/basic/packages
And obviously there are also players available. But they are crazy expensive and I’ve not seen any 4K disk for sale in Indonesia yet (I guess they’re also hard to copy ).

NB: I remember reading somewhere Netflix and Amazon still can’t provide the same quality what you get on disc, related to streaming speeds of course.

 

[R Cameron]

thanks..
1. I've checked the specs of my graphics card and it maxes out at 1920x1080 so there's no 4k output. i bought my computer about 5 years ago when 4k was not common so that's probably why.

anyway, it got me thinking do I really need a 4k tv.? There's no 4k broadcasts in Indonesia and even if there were my slow internet would struggle with it. I may just go with a regular "fullhd" tv.

As you are realizing, there is no use to 4K TVs right now for most people. If you have fast and unlimited internet, perhaps there are some YouTube or Netflix videos you would enjoy watching in 4K, but the difference from 1080 HD to 4K is by most accounts very minor since 1080 HD is already very good.

You keep mentioning a computer, if this is to work primarily as a computer monitor, you should look at computer monitors and not TVs. There are some differences that make computer monitors better suited for desktop computer use. If you want 35-70" screen and/or the primary use is watching videos from the computer, go ahead and look at the TVs. Either way, "Full HD" or "1080P" would be the smart choice to match your graphics card.

2. I'll check out the possibility of increasing the rating of the circuit breaker but what about a resistor in the power supply to the water heater.? wouldn't that restrict the current .?

Resistors create heat and consume electricity, I would be extremely cautious about that. The first thing to check is the size of wiring from your circuit breakers to the appliance, and compare that to electrical guidelines for how many amps it can safely handle. If it can safely handle 20A, that's you're easiest solution, change your circuit breaker. The other proper solution would be to have the heating element inside the water heater changed to a lower wattage, this would likely require a specialist.

 

[rabbit_39]

Re:water heater. The short answer is you can't unless the water heater itself is drawing less power. Putting a resistor between it and the electricity supply will just mean less power reach the water heater but the same amount will be drawn from the plug .

 

[Pak Tani]

The short answer is you can't unless the water heater itself is drawing less power. Putting a resistor between it and the electricity supply will just mean less power reach the water heater but the same amount will be drawn from the plug .

Not completely true. If you add a resistor in your electrical system, the current will decrease (as I = U / R). Consequently your power consumption will decrease (as P = U x I) Unfortunately heating water will take longer so you will not save anything, rather you'll waste energy that is 'consumed' by the resistor.
And finding a suitable resistor for your water heater could be a bit of a problem.
Simplified => If your water heater is rated at 3.300W (15A) it's electrical resistance is 220V/15A = 14,7 Ohm. If you add, let's say, a 10 Ohm resistor to your system, the total electrical Resistance will be 24,7 Ohm. So consequentlty the electrical current will be much less and probably be around 8,9 A. The combined power consumption of your water heater ànd Resistor will then be 1.960W. Sounds good, right? Well, the problem now lies in the power consumption of the Resistor. It will become very hot. You could even think of using it as...a water heater?

Wonder what would happen if you add a 20A diode in stead of a resistor. This will block half of the sinus wave and decrease the power consumption the water heater. Just don't try this if it has any electronics inside.

 

[Daniel50]

To simplify all of this, stick with the non- 4k tv for now.

 

[jstar]

I haven't looked at the price difference between HD and UHD sets in Indonesia, recently. In Europe the prices of the 4K TV's dropped a lot (€500-800) and for bigger screens (>48") most models on sale are UHD. If you can do a good deal on 4K and the TV has HDR10 and Dolby Vision, I would do it. But with regular HD, I wouldn't be concerned about it becoming obsolete soon.
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For 4K via your phone you would need between 15 and 25 Mbps so that's quite challenging. And yes, you can forget high quality free-to-air here for most TV channels. But they do already have DVB-T here, which is digital broadcast via the antenna. And practically all TV's have a DVB-T tuner as well, so you just need to connect a good antenna. But not all Indonesian TV channels jumped on the digital free-to-air band wagon. (Many only deliver their digital services via cable.) Still, 4KUHDTV will be available over DVB-T[sub]2[/sub]. One day.
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[snpark]

Doesn't the programme have to be screened or broadcast also in 4G for it to work?

Anyway, regardless the actual content shown is still only 1G, with B&W instead of blood and cigarettes and blurred out cleavage