What does Kirchhoff's Current Law (KCL) state?

• A. Ohm's law relates voltage, current, and resistance
• B. The product of currents around a loop equals zero
• C. The sum of voltages around a loop equals zero
• D. The sum of currents entering a node equals the sum leaving

Answer: (D)

Kirchhoff's Current Law is about conservation of charge at a junction. At any node where wires meet, the total current flowing into the node must equal the total current flowing out. In practice, you can assign a sign to each current (positive for entering, negative for leaving) and the sum at the node should be zero. This allows you to set up node equations that relate all currents in the network.

The other statements don’t fit because Ohm's law describes the relationship between voltage, current, and resistance, not how currents balance at a node. The statement about the sum of voltages around a loop is Kirchhoff's Voltage Law, which governs voltages around a closed path, not currents at a node. And there isn’t a rule that the product of currents around a loop equals zero.