Question

An alarm clock has a current of 4.5 amps and a resistance of 3.2 ohms. What is the voltage in the circuit?
A.1.4 volts
B.0.71 volts
C.14 volts
D.46 volts

Answer 1

Answer: C. 14 volts

Explanation:

According to Ohm's law, the voltage $V$ is:  

$V=R.I$   (1)

Where:

$R=3.2\Omega$ is the resistance of the clock

$I=4.5A$ is the electric current that flows throgh the clock

Substituting these values in (1):

$V=(3.2\Omega)(4.5A)$   (2)

$V=14.4V\approx14V$