Question

a cell phone uses 3.0V battery. the circuit board needs a 0.05 A current. what size resistor is needed to generate this current

Answer 1

60 Ohms

Step-by-step explanation:

Ohms law states that the voltage in the circuit is directly proportional to the current through the circuit components and expressed as

V=IR

Where V is the voltage, I is current and R is resistance

Making R the subject of the formula then

`R=\frac {V}{I}`

Substituting 3.0V for V and 0.05 A for I then

`R=\frac {3}{0.05}=60.0`

Therefore, resistance is 60.0 Ohms