Physics for IGCSE & O level - Electricity (Section 8 - No. 23)
If the voltage across a 4-ohm resistor is 12 volts, what is the current flowing through it?
3 amps
4 amps
8 amps
48 amps
คำอธิบาย
Using Ohm's Law (I = V/R), the current is 12V / 4 ohms = 3 amps.