# Ohmâ€™s Law

Definition of Ohmâ€™s Law
Physical states (temperature, material, etc.) of a conductor remaining constant, the current flowing through a conductor is directly proportional to the potential difference across the two ends of the conductor.

This general statement of Ohmâ€™s law can be extended to cover inductances and capacitors as well under alternating current conditions and transient conditions.

# Kirchhoffâ€™s Current Law (KCL)

Kirchhoffâ€™s current law is based on the principle of conservation of charge. This requires that the algebraic sum of the charges within a system cannot change. Thus, the total rate of change of charge must add up to zero. Rate of change of charge is current.

Illustration of KCL

# Kirchhoffâ€™s Voltage Law (KVL)

Kirchhoffâ€™s voltage law is based on the principle of conservation of energy. This requires that the total work done in taking a unit positive charge around a closed path and ending up at the original point is zero.

Illustration of KVL