Final answer:
The voltage across the battery in a parallel circuit with three resistors, each having a voltage of 2 V, is 2 V. This is because in a parallel circuit, the voltage across each component is the same as the voltage across the battery.
Step-by-step explanation:
The question asks about the voltage across the battery in a parallel circuit containing three resistors, each with a voltage of 2 V. When resistors are connected in parallel, the voltage across each resistor is the same and is equal to the voltage of the battery. Therefore, regardless of the number of resistors in parallel, if each resistor has a voltage of 2 V, then the voltage across the battery in the circuit is also 2 V. The question also refers to series circuits and while in a series circuit the voltages across different components would add up, this doesn't apply to the given problem involving a parallel circuit. Applicable principles in electrical circuits help determine that the voltage across components in parallel is equal to the voltage supplied by the battery.