To find current in a 12v circuit with 3 ohms of resistance you take v/r. That equals current. So 12/3=4 so 4 amps. The second half of your question is similar. P/V is what we will use to answer this. 60/120.

So that comes to .5 amps. Look up ohms law. That is how to find answers like that for electrical circuits.

So that comes to .5 amps. Look up ohms law. That is how to find answers like that for electrical circuits.