i) A LED is connected in series with a R1 resistor with a supply voltage of 12 V . The LED rated current is 20 mA and has a voltage drop of 1.5 V. Calculate the value of the series resistance R1.ii) A zener diode regulator is connected in series with a resistor R and in parallel(in series with the resistor) with a load whose voltage is 12 V and has a drawing of current of 300mA. The power supply is rated a 24 V @ 500 mA. Find the value of the series resistance R. iii) What would be the inductive reactance in ohms of a 9 henry inductor at a frequency of 60Hz ?iv) What would be the capacitive reactancein ohmsof a 0.01 microfarad capacitor at a frequency of 590000 Hz ?v) What is the time constant of a RC circuit consisting of a 2000 ohms resistor and a 10 microfarad capacitor ?