What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA?
A. 8.2 kΩ
B. 820 Ω
C. 8.2 Ω
D. 82 Ω
Answer: Option D
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Related Questions on Ohms Law
How much current is produced by a voltage of 18 kV across a 15 kΩ resistance?
A. 1.2 A
B. 12 A
C. 120 mA
D. 12 mA
A. 183 Ω
B. 18.3 Ω
C. 66 Ω
D. 6.6 Ω
First I=?
R=3.3M ohm
V=30V
So,
I = V/R
I = 30÷3.3 × 10^6
I =9.09 micro amp
SO, I= 9.O9 ~ 9 micro amps