In a parallel circuit with resistors R1 = 30 Ohms, R2 = 15 Ohms, and R3 = 10 Ohms, if the current through R2 is 4 Amps, what is the source voltage?

In a parallel circuit, the voltage across each component is the same and equal to the voltage of the source. When you know the current flowing through a particular resistor, you can use Ohm's Law to determine the source voltage.

For resistor R2, with a resistance value of 15 Ohms and a current of 4 Amps flowing through it, you can calculate the voltage across R2 using the formula:

Voltage (V) = Current (I) × Resistance (R).

Substituting in the known values:

V = 4 Amps × 15 Ohms = 60 Volts.

Since R2 is part of a parallel circuit, this voltage is equal to the source voltage. Therefore, the source voltage is 60 volts, confirming that the correct answer is indeed 60 volts. The calculations affirm that the relationship of current and resistance in this scenario directly leads to determining the source voltage effectively.