Parallel Circuit Past Exam Question - A Level Physics

[@omdhol3633]

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[@thepocketsofpolly145]

Why is the voltage across the 2ohm resistor is equal to the supply pd? What would the voltages be across the 4ohm and 1ohm resistor? Thank you in advance

[@vt.physics]

According to kirchoffs law, the sum of all the voltages around any closed loop in a circuit is zero. So the voltage across the 2 ohm resistor has to be the same as the supplied voltage. In other words, each loop in a parallel circuit had the same voltage as the power supply's voltage.