Question

ucuruly ISIS ldlice
A cell phone uses a 3.0 V battery. The circuit board it uses needs a 0.05 A current. What size resistor is needed to
generate this current?

Answer 1

R = 60 Ω

Explanation:

Given:

Voltage V = 3.0 V

Current I   = 0.05 A

By using the Ohm's law, we can calculate the resistance:

V = IR

where V is the voltage

I is the current and

R is the resistance

Now, substituting the values given in the Ohm's law equation, we get:

V = IR

R = V/I

   = 3/0.05

R = 60 Ω

Thus, the size of the resistor needed is :  60 Ω