Ohm''s Law

Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?

A 4

B 400

C 4 k

D 4.4

ANS:C - 4 k

v = 12,

I = 3 * 10^-3 A,

R = v/I, = 12/3X10^-3=4X10^3 ohms=4K ohms.

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