**Lagging power factor**

An operating power factor condition such that the phasor current lags the phasor voltage.

**Leading power factor**

An operating power factor condition such that the phasor current leads the phasor voltage.

**Linear electromagnetic system**

An electromagnetic system whose flux linkages are expressed as linear combinations of the currents in. terms of the self-inductance of each winding and mutual inductances between the windings.

**Load curve**

A curve of power versus time showing the value of a speciﬁc load for each unit of the period covered.

**Loop**

A loop is a path that starts and ends on the same node with all other nodes in the loop touched only once.

**Load**

The load in a circuit is the device where the power or energy is consumed.

**Low-Pass Filter**

A filter network that passes all frequencies below a specified frequency with little or no attenuation but discriminates against all higher frequencies.

**Linearity**

The system is linear if it is both additive and homogeneous.

**Leakage Flux**

Flux lines, originated by the primary winding, that fail to link the turns of the secondary winding.

**Linear Resistance**

A linear resistance has a resistance that is constant with relation to current and voltage.

**Lenz’s Law**

It states that the induced emf in an inductor always opposes the current change that produced it.