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Electronics - Ohm's Law

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Exercise :: Ohm's Law - Filling the Blanks

1. 

If the voltage across a resistor ___, the current flowing through it will increase.
A. increases
B. decreases
C. stays the same
D. Not enough information

Answer: Option A

Explanation:

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2. 

The voltage across a ___ resistor is 12 V and the current through it is 500 mu.gifA.
A. 600 omega.gif
B. 2.4 komega.gif
C. 6 komega.gif
D. 24 komega.gif

Answer: Option D

Explanation:

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3. 

The voltage supplying the current in the given circuit is _____.
A. 2.5 V
B. 25 V
C. 250 V
D. 2.5 kV

Answer: Option B

Explanation:

V = IR

= 250 x 10^-6 x 100 x 10^3

= 250 x 100 x 10^(-6+3)

= 250 x 100 x 10^-3

= 25 x 1000 x 10^-3

= 25 x 10^3 x 10^-3

= 25 x 10^0

= 25 x 1 [Anything power 0 is 1]

= 25 volts.

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4. 

The voltage across a 2.2 komega.gif resistor is ___ if 3 mA of current is flowing through it.
A. 6.6 V
B. 7.33 V
C. 1.4 V
D. 0.8 V

Answer: Option A

Explanation:

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5. 

The power rating for the resistor in the given circuit should be at least ___.
A. 1/4 W
B. 1/2 W
C. 1 W
D. 2 W

Answer: Option B

Explanation:

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