In a circuit, V 2 V and I 10 mA. If V is changed to 1 V, what will I equal?
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A Light - emitting diode is a forward based P-N junction that emits light.
The voltage across it = 2 v
Battery voltage = 6 v
Hence total voltage in the circuit = V = 6 - 2 = 4 v
since a LED has 0 resistance in the forward based region, the total resistance in the circuit
= 0 + r = r
current I = 10 mA = 10/1000 A = 0.01 A
we know that,
R = V/I
=> r = 4/0.01 = 400Ω
Hence the value of the limiting resistor is 400Ω
Explanation:
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