If V(dropped)=I(resistor)*R then
7 V = 0.5 A * x Ω
x = 7 V / 0.5 A = 14 Ω
It doesn't seem like I calculated corectly. Plus in the ecuation I have only the intensity of the resistor(500mA), what about the intensity of the power source?
and what if I want to lower the intensity. I have:
Power source:
Tension: 12 V
Intensity: 500 mA
Thing I need to power:
Needs 5 V
No more than 100mA
I need to know what resistor should I buy. How many Ω and how many ampers should the resistor have?
7 V = 0.5 A * x Ω
x = 7 V / 0.5 A = 14 Ω
It doesn't seem like I calculated corectly. Plus in the ecuation I have only the intensity of the resistor(500mA), what about the intensity of the power source?
and what if I want to lower the intensity. I have:
Power source:
Tension: 12 V
Intensity: 500 mA
Thing I need to power:
Needs 5 V
No more than 100mA
I need to know what resistor should I buy. How many Ω and how many ampers should the resistor have?