In a parallel circuit, the current through a resistor can be found using I = V / R.

• A. I = R / V
• B. I = V - R
• C. I = V / R
• D. I = V * R

Answer: (C)

Ohm's law states that current through a conductor equals the voltage across it divided by its resistance. In a parallel circuit, each resistor has the same voltage across it as the source, so the current through a given resistor is found by I = V/R for that resistor. This gives the current in amperes when V is in volts and R is in ohms. The other options don’t match Ohm's law: R/V isn't current, V - R is a subtraction with no physical meaning for current here, and V * R multiplies voltage and resistance, which does not yield current. Therefore, I = V/R is the correct relationship.