How do you calculate the resistance of a current limiting resistor?
How do you calculate the resistance of a current limiting resistor? R = V/I = 1.3V/0.015A = 86.67\Omega . In practice, it can be difficult to obtain a resistor with a resistance of precisely 86.67 Ω. How do you calculate the capacitor value of a transformerless power supply? Current I = V/Z, where V is the voltage and Z is the impedance. Capacitive Reactance XC1 = 1/(2πfC), where f is the frequency and C is the capacitance. I = (Vin – Vd – Vz)/(X1 + R1) = (230 – 0.7 – 12)/(4637 + 100) = 0.046A = 46mA. How do...