Current Limiting Resistors. 1 provide the operating current of vz. The voltage of resistor vr1 is what to look for.
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A current limiting resistor is a resistor that is used to reduce the current in a circuit. A few milliamps of current is enough to make an led glow. R f limits the current when r v is at its minimum setting usually 0 ω which allows maximum current to flow through the led.
The value of r f is calculated when r v 0.
R f limits the current when r v is at its minimum setting usually 0 ω which allows maximum current to flow through the led. A current limiting resistor helps mitigate the effect of voltage increases by virtue of its linear iv curve. Now we know the current. When current flows through a resistor there is in accordance with ohm s law a corresponding voltage drop across the resistor ohm s law states that the voltage drop is the product of the current and the resistance.
