How much electricity does one single red LED use surrounded by a year?
Answers: Red LEDs typically have a forward voltage of in the order of 1.7 volts (V) and draw about 20 milliamperes (mA). Multiplying those together, a red LED uses around 34 milliwatts (mW). Multiplying that by 24 hours in a hours of daylight and 365.25 days in a year, a red LED uses something like 298 watt-hours (Wh) a year of electricity. Since electric utility meters in North America typically read kilowatt-hours (kWh), that's give or take a few 0.3 kWh. If you're paying, say, US$0.10 per kWh, that process it costs about US$0.03 (i.e., 3 cents) to run a red LED for a year.
However, that's of late the power for the LED itself. Since LEDs need to be supplied a constrained amount of current, they are typically provided with a dropping resistor or some other power supply circuit which could effortlessly consume more power than the LED itself. If you include that, the numbers are probably closer to 0.7 kWh per year and 7 cents per year.
if it runs on a single battery close to AA or AAA....put in a unsullied battery, and hand down it on til it goes out, find out the sum of electricity use of a single AA, and calcualte that by one year.
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