A 12 \Omega resistor is connected to a 6 \mathrm{V} battery. What current will flow in the resistor?
Here we must use I=V/R (where V=6 \mathrm{V} and R=12 \Omega ):
I=V/R=6 \mathrm{V}/12 \Omega=0.5 \mathrm{A}(\text { or } 500 \mathrm{mA})
Hence a current of 500 \mathrm{~mA} will flow in the resistor.