What current will flow when a 10 µF capacitor is connected to a 120 V, 60 Hz power supply?

Study for the 3rd Class Power Engineering (3A2) Exam. Explore multiple choice questions with hints and explanations. Prepare for your certification!

To determine the current that will flow when a capacitor is connected to an AC power supply, you can use the formula for capacitive reactance and the resulting current.

Capacitive reactance (Xc) is calculated using the formula:

[ Xc = \frac{1}{2\pi f C} ]

where:

  • ( f ) is the frequency in Hz (60 Hz in this case),

  • ( C ) is the capacitance in Farads (10 µF = 10 x 10^-6 F).

First, we can calculate the capacitive reactance:

  1. Convert the capacitance from microfarads to farads:

( C = 10 \times 10^{-6} F ).

  1. Substitute ( f ) and ( C ) into the formula:

[ Xc = \frac{1}{2\pi(60)(10 \times 10^{-6})} ]

Calculating this gives:

[ Xc = \frac{1}{2\pi(60)(10 \times 10^{-6})} \approx 265.26 , \Omega ]

Next, the current ( I ) can be calculated using Oh

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