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How many watts can an led need to light up?

It depends on the color of the led you have. Normally it changes between 1.5 V and 2.5 V. But if you need to use white or purple leds those leds need more power like 4-5Volts. Im gonna calculate for a standart red led, a red led needs 20 mA and 2 volts to light up. So we know the formula that we can calculate how many watts does the led need, P = U * I P = 2 * 0.02 = 0.04 W. I used the average values. I hope I didnt make any mistake :)


How can I convert lux to watts in order to determine the power of light emitted by a source?

To convert lux to watts, you need to know the luminous efficacy of the light source in lumens per watt. Then, you can use the formula: Power (watts) Illuminance (lux) x Area (square meters) x Luminous Efficacy (lumens per watt). This calculation will help you determine the power of light emitted by a source.


How many watts in 7000 joules?

To convert joules to watts, you need to know the time over which the energy is expended. Since power in watts is defined as energy in joules divided by time in seconds, you cannot directly convert 7000 joules to watts without knowing the time duration.


What temperature is 1100 watts into Celsius?

To convert watts to temperature, you need more information such as the specific heat capacity of the material being heated. Watts is a measure of power, not temperature.


How many watts are in 13 amps?

Excellent question. That depends on the voltage, for 120 VAC, the answer is 156 watts. PIE, Power (in watts) = current (amps) X Voltage . For 12 VDC, 15.6 watts. An interesting asside, if you ohms check a 120 watt (should draw 1 amp) incandesent light bulb, it will read much less than you would expect (120 ohms). Turns out, the filament at room temp is much more conductive.