Physics for IGCSE & O level - Electricity (Section 9 - No. 9)
If a circuit has a potential difference of 12V and a resistance of 4 ohms, how much current flows?
3 amps
4 amps
12 amps
48 amps
Giải thích
Using Ohm's Law (I = V/R), 12V / 4 ohms = 3 amps.