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Ohm''s Law - Engineering

Q1:

What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA?

A 8.2 k

B 820 

C 8.2 

D 82 

ANS:D - 82 

I = 220 * 10^-3 = 220/1000,
V = 18,
R = V/I = 18/(220/1000),
R = (18 * 1000)/220,
R = 900/11,
R = 81.9.
Answer:- R~82 OHM.