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Questions and Answers
Define apparent power and explain how it is measured in an AC system.
Define apparent power and explain how it is measured in an AC system.
Apparent power is the total power flowing in an AC system. It is measured as the product of voltage and current.
What is power factor and what is its significance in modern computers?
What is power factor and what is its significance in modern computers?
Power factor is the ratio of active power to apparent power. It is a number between 0.0 and 1.0. Most modern computers have power factor corrected power supplies, which have a power factor of .95 or better.
What causes poor power factor and why do utility companies charge for active power?
What causes poor power factor and why do utility companies charge for active power?
Poor power factor is usually caused by large inductive loads such as motors. Utility companies charge for active power because it is the portion of power that is absorbed and used by the load.
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Study Notes
- Apparent power is the total power flowing in an AC system.
- It is measured as the product of voltage and current.
- Active power is the portion of power that is absorbed and used by the load.
- It is always equal to or less than the apparent power.
- Power factor is the ratio of active power to apparent power.
- Power factor is a number between 0.0 and 1.0.
- Most modern computers have power factor corrected power supplies.
- Power factor corrected power supplies have a power factor of .95 or better.
- Utility companies charge for active power.
- Poor power factor is usually caused by large inductive loads such as motors.
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