Question

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

Answer 1

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 .