Question

Kirchhoff's first rule of any junction of several circuit element in an electric circuit is based on the law of conservation of:

• A. Mass
• B. Charge
• C. Linear momentum
• D. Energy

Answer 1

Answer: (B)

Charge

Answer 2

Kirchhoff's first rule of any junction of several circuit elements in an electric circuit is based on the law of charge conservation.

Kirchhoff's first rule:

This law is also known as the junction rule or current law (KCL). According to it the algebraic sum of currents meeting at a junction is zero i.e. Σi=0.

In a circuit, at any junction, the sum of the currents entering the junction must be equal the sum of the currents leaving the junction i.e., i1+i3=i2+i4

This law is simply a statement of “conservation of charge” as if current reaching a junction is not equal to the current leaving the junction, the charge will not be conserved.

Hence, the correct option is (B).