Question

a current of 20mA flows through a wire when a potential difference of 5Vi is applied between its ends. the resistance of the wire must be______​

Answer 1

Answer:

R=V/I.

R=0.215=75Ω

Explanation:

Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. Introducing the constant of proportionality, the resistance, we arrive at the usual mathematical equation that describes this relationship: I=RV,

where, I is the current through the conductor in units of amperes, V is the potential difference measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms.

Answer 2

Answer:

Resistance = 250 ohms

Explanation:

R = V/I

20mA = 20 x 10^-3 = 0.02 A

R = 5V / 0.02 A

R = 250 ohms