Question

HELP ASAP!! Ohms law homework

Answer 1

4a)

According to Ohm's law (Current) = (Voltage)/(Resistance)

Given the values: (Current) = 9V / 470 Ohm = 19.1 mA

The current through the LED is 19.1mA, or 0.019A

4b)

(max current) = (voltage)/(min resistance) =>

(min resistance) = (voltage)/(max current) = 6V / 0.05 A = 120 Ohm

The resistor must be at least 120 Ohm, otherwise the LED will fry.