Question

When a 4V battery is connected across an unknown resistor there is a current of 100 mA in the circuit . The value of the resistance of the resistor is..
A) 4 ohm
B) 40 ohm
C)400 ohm
D)0.4 ohm

Answer 1

Answer:

4 ohm

Explanation:

use V=IR

R=V÷I

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Answer 2

Answer:

B) 40ohm

Explanation:

1A = 1000mA

therefore, 100mA = 0.1A

and, R=V/I

R= 4/0.1 = 40/1

R=40ohm