A circuit with a source of 120 volts is connected across four parallel 60 ohms resistors. The current through each resistor is:

• A. 1 A
• B. 2 A
• C. 3 A
• D. 4 A

Answer: (B)

In a parallel circuit, the voltage across each branch is the same as the source. So each 60-ohm resistor has 120 V across it. Using Ohm’s law, the current in each resistor is I = V/R = 120 V / 60 Ω = 2 A. Therefore, the current through each resistor is 2 amperes. The total current from the source would be four times that, 8 A, but the question asks for the current in a single resistor, which is 2 A.