ohm's-law electronics question and answers -Page 5

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Ohm's Law problems

1. The power is ___ if 200 J of energy are used in 10 s.
Options
A. 2 W
B. 5 W
C. 20 W
D. 50 W

Discuss

Correct Answer: 20 W

2.

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

Discuss

Correct Answer: 25 V

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.

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

Discuss

Correct Answer: 6.6 V

4. The current is ___ if the voltage across a 5 kΩ resistor is 25 V.
Options
A. 200 mA
B. 125 mA
C. 75 mA
D. 5 mA

Discuss

Correct Answer: 5 mA

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