Question

When a 4 volt battery is connected across an unknown resistor there is a current of hundred ma in?

Answer 1

Answer:

Resistance = 40 Ohm.

Explanation:

V = 4volt ; I = 100mA and 1 mA equals to 10^-3A. So I = 0.1A ; R = ?

By Ohm's law,

V = IR.

So, R = V/I

= 4/0.1 = 40/1 = 40.

Therefore the resistance applied is 40 Ohm.

Answer 2

Answer:

v=iR

R=v/i

v=4 volts

i=100^-3 A

therefore. R=40ohm