This is because a resistive load is coupled to the tuned circuit.

Since incandescent lamps are resistive loads, simple thyristor dimmers can be used to control brightness.

The overall power is reduced by any inductive component of the resistive load.

Incandescent lamps are nearly pure resistive loads with a power factor of 1.

There are measurements not using resistive load but actual loudspeakers to back this up.

In the first test period all electrical power was converted to heat over a three phase delta-connected resistive load.

A purely resistive load (such as a filament lamp, heater or kettle) exhibits a power factor of 1.

A reduction in voltage does not greatly affect the energy used by the domestic appliances which use resistive loads.

Big losses in strata, resistive load, have to overcome.

Even some resistive loads provide only short-term benefits.