3.1. Power Levels

Try these first

1. 1.

   What is active power?

   Hint

   Think about power that does something useful in a circuit.

2. 2.

   How is reactive power measured?

   Hint

   Consider what happens in an AC circuit.

3. 3.

   What does active power perform?

   Hint

   Think about devices that use electricity to do tasks.

4. 4.

   True or False: Reactive power is useful for performing work.

   • True
   • False

   Hint

   Consider what happens in AC circuits.

5. 5.

   A high-power circuit has a voltage of 400 V and operates at a current of 25 A with a phase angle of 45 degrees. Calculate the active, reactive, and apparent power. Discuss how choosing the wrong component in such a circuit could lead to failure.

   Hint

   Use trigonometric ratios to simplify calculation.

6. 6.

   Explain how reducing reactive power enhances efficiency in an AC circuit and propose techniques for minimizing it.

   Hint

   Consider methods that address power factor in AC circuits.