Final answer:
The statement is false; a power factor close to 0 indicates a highly reactive circuit, not one with mostly true power. A power factor of 1, not 0, signifies that a circuit is converting all the power to work, which happens in a purely resistive or resonant RLC circuit.
Step-by-step explanation:
The statement "Power factor values close to 0 denotes an RC circuit with mostly true power" is false. In electrical circuits, particularly in AC (alternating current) circuits, the power factor is a measure of how effectively the current is converted into usable power. The range of the power factor is from -1 to 1.
A power factor of 1 indicates that all the power is being effectively converted to work (true power), and this occurs in a purely resistive circuit or an RLC circuit that is at resonance. In such cases, the voltage and current are in phase (a phase angle of 0°).
When dealing with an RC (resistor-capacitor) circuit or RL (resistor-inductor) circuit, the power factor will be less than 1 because these circuits have reactance that causes the current and voltage to be out of phase. In the extreme case where the circuit is purely capacitive or purely inductive, the power factor can approach 0, indicating that most of the power is reactive and not true power. A low power factor close to 0 signifies that the circuit is highly reactive, and thus, it does not indicate that it has mostly true power.
For example, if the phase angle is close to 90°, such as in a pure RC circuit at a low frequency, the power factor would be cos(90°) which is 0. This confirms that in a pure RC circuit, voltage and current are 90° out of phase, leading to no true power being delivered.