Why do I need an led driver to power my 100 watt led?
Any LED is a current based diode. It isn't the Volts or the Watts that make the light, but the current. An incandescent bulb uses a filament of wire that gets hot and changes resistance as it does so. This increase in resistance mostly balances out the increase in current and keeps the filament from overheating. With an LED, this does not happen. It does not generate light from getting hot. The current flowing through the PN junction makes light by "recombination" of "holes" and electrons ("holes" merely being an absence of an electron where one would normally be found), Because of this, you must CAREFULLY regulate the current or the LED will overheat and stop producing light. For LEDs the Watts tends to be based on the current the diode needs for full light output with the Watts divided by the voltage of the average diode chip. At 4V or so, a 1W LED diode would need about 250mA. This translates into about 200 lumens for a 1W LED chip. You need about 1200 lumens for the equivalent of a 100W incandescent, or about 10W of LED power. A clever trick nowadays is to string them out in series at lower current to get the same effect with a lower voltage PSU. At 80V and 4 strings (series / parallel connections) that can work out to 20 or so LEDs in series with 4 strings running at 125mA each. Much easier on the LED diode chips, but a tough nut for the regulator / driver.Here's an extreme example:https://www.google.com/search?biw=1280&bih=946&tbm=isch&sa=1&ei=9B-6W_bBHozXjwTwmonwAQ&q=led+filament&oq=led+filament&gs_l=img.3..0l10.10538.12872..15891...0.0..0.89.658.8......1....1..gws-wiz-img.......0i67.2M4eVv4hn90#imgrc=WG94ijo-Ilk5gM:&spf=1538924549741
What determines power (watt) in a step down?
We assumed you are describing a step down transformer,Power (in watts) can be calculated by the product of volt times current. But since AC power is changing polarity from positive to negative continuously, something called power factor comes into consideration. This decides the maximum power in watts you can draw safely from the device.Transformers are most commonly rated in VA called Volt-Amps, so considering you have a 1KVA transformer with a 0.6PF rating, then the maximum power you can draw from it is 1000 multiplied by 0.6 which is 600W. This can be termed as the breakdown limit of the transformer.In other words, you can safely and continuously draw a nominal of up to 300Watts from the transformer without it burning down.I hope this helps:)CHEERS!
How many hertz are in 1 watt?
Hi Diana,The two are actually exclusive to each other.A “watt” is a descriptive term used in both “DC” or “direct current”, where electrons in a circuit only move in one direction, from the “Ground” or minus” pole to the ��V+” or “positive” pole; and “AC” or “alternating current”, where electrons move back and forth in the circuit in what are called “half-waves”.In each “half-wave”, the movement is opposite to the other, and the “back and forth” electron movement. A “hertz is defined as one back and forth cycle occurring in one second of time as defined by Heinrich Rudolph Hertz. The Unites States AC system uses 60 Hertz (Hz), or 60 back and forth electron movements per second, while the rest of the world uses 50 Hertz (Hz).Now, having said all of that — I’ll say this.A watt value is a product combination, in both AC and DC, of voltage and amperage, with all of the combinations that mathematically are possible, so no one combination is sacrosanct. The basis definition though is amperage multiplied by voltage in one second of time.I hope this helps
How much volts is 10 watts?
IN case of DC Supply:P=V*I10 Volts , 1 Amp=10 Watt100 Volt,0.1 Amp=10 WattIn case of single phase AC Supply:P=V*I* power factorP=10*2*0.5=10 wattorP=100*1*0.1=10 wattIn case of three-phase AC supply:P=1.732*V*I*power factorThe power drawn depends on type of supply system,connected load and the power factor of the load.
How do I calculate how many watts a particular appliance uses when plugged in to electricity? For example, an iron that requires 10A to operate. How many watts would it require when plugged in to a power source?
You can calculate the power consumed by applying Ohm's Law. I'm sure you would have learned it in school and forgotten about it. So, the basics would be to understand the formula at least.P = V*Iwhere P is the power consumed by the device and is calculated in Watts,V is the potential difference (source voltage), that is 220 volts,I is the current passing through the device, and calculated in Amperes, which in this case is 10A.Once you understand this logic, it's just a simple math to calculate the power consumed.P = 220 * 10P = 2200W or 2.2kWThis device will consume 2.2kW in hour, if run continuously (in theory). Know that the there are some devices, such as the iron or a toaster, that consume power intermittently. So, when you see the heater light/LED on, it is consuming 2.2kW, and when it is off, it it is not consuming any power.Cheers!
What is the consequence of using a lower wattage power adapter with a laptop?
Let’s start by saying that I have done this. And… I’ve done it on more than one occasion, and I’ve done it on purpose to know what will happen.I ran a Toshiba Satellite A75 on a 90 watt adapter for a couple of months, while it required a 120 Watt adapter. Here is what happened. Under normal usage conditions… checking email, surfing the web… light tasks, the battery would get hot, but otherwise the laptop would perform normally. If I played any games, the laptop would turn off within 60 seconds of starting the game. If I did any CPU intensive tasks while not gaming, whether or not the laptop would turn off, depended on how long I ran the tasks for. If I removed the battery, the unit would not turn itself off when doing CPU intensive tasks outside of gaming, but gaming would still bring the laptop to shutdown… albeit just more like 20 minutes into it, instead of 45 seconds.I’ve tested laptops that required 90 watt adapters with 65 watt adapters.Is it dangerous? No. The laptop isn’t going to explode. The power adapter isn’t going to explode. The battery isn’t going to explode. What *will* happen then? All depends. Nothing might happen. Or… the laptop might turn off because it is trying to draw more power than is available.But it won’t explode. It won’t rise up and attack you either because you are starving it of power.
A bulb is rated 100W and 220V. What does it mean?
Electrical appliances are designed for particular power output/consumption based on system voltage. This light bulb is designed to be used in a country or system that uses 220 volts AC in ordinary end user applications, as in a home. Iceland is such a country, in contrast to the USA which uses 110V AC in these relatively low power demand uses. Now power (Watts) is the combination of current (amperage) and voltage. So the 100 W lightbulb has a resistance that permits a current at 220V that gives a power consumption of 100 Watts. If you used this light bulb in a 110V system it would use only half the power and produce less light.220 Volt systems are considered somewhat riskier than 110V systems however they allow these systems to use thinner conductors, saving costs, or to power higher power appliances. Icelandic tea kettles come to a boil faster than their 110V cousins in North America.