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If you will put an LED in a series with resistor in 220 volts what is the resistance of resistor?
Wiki User
∙ 15y ago
Ohms law is: R= V x I (resistance = voltage / current) ...where an led typically likes 20mA (0.02A) of current running through it and 2V of voltage across it, therefore:
R= V x I = (220-2) / 0.02 = 218 / 0.02 = 10,900 ohms = 10.6kohms (10kohms will do fine).
hope that helps
Wiki User
∙ 15y ago
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What size resistor is needed to allow a 220 volt coil in a relay operate on 277 volts?
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What is the resistance value if you connect the 3 volts led at 220 volts?
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The formula you are looking for is R = E/I
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A 4000-Ω resistor is connected across 220 V what current will flow?
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