In a series circuit, the current is the same at every point, so the current through the 6-ohm resistor is also 4 Amperes. Voltage across a resistor = (current through the resistor) times (resistance of the resistor) . Voltage across the 6-ohm resistor = (4 Amperes) x (6 ohms) = 24 volts .
A 3.0-ohm resistor and a 6.0-ohm resistor are connected in series in an operating electric circuit. If the current through the 3.0-ohm resistor is 4.0 amperes, what is the potential difference across the 6.0-ohm resistor? (1) 8.0 V (3) 12 V (2) 2.0 V (4) 24 V