AC theory lesson 7

30 microfarads = ? farads.

.00003

200 picofarads = ? farads

0.0000000002 (9 zeros)

What is the capacitive reactance of a 200-picofarad capacitor when connected to a 700-kilohertz, 500-volt source? (Round the FINAL answer to the nearest whole number.)

1137

Solve for the capacitive reactance and the capacitance in the circuit shown. (Round the FINAL answers to at least two decimal places in the specified unit.)

120Ω 22.1µF

A 200 µF capacitor is connected to a 60-hertz source. What is its capacitive reactance? (Round the FINAL answer to one decimal place.)

13.3Ω

How much current flows in a 240-volt, 400-hertz circuit that is connected to a 50-microfarad capacitor? (Round the FINAL answer to the nearest whole number.)

30A

In this circuit, IT = 0.05 A, C = 0.5 µF, and XC = 100Ω. Solve for f. (Round the FINAL answer to the nearest whole number.)

3183Hz

400 kilohertz = ? hertz

400000

In this circuit, IT = 0.05 A, C = 0.5 µF, and XC = 100Ω. Solve for ES.

5V

Solve for the capacitive reactance and the capacitance in the circuit shown. (Round the FINAL answers to at least two decimal places in the specified unit.)

60Ω 2.65µF

Solve for the capacitive reactance and the total current in the circuit shown. (Round the FINAL answers to at least two decimal places in the specified unit.)

79.58Ω 1.51A

The capacitive reactance of a 240-volt, 60-hertz circuit is 30 ohms. What is the current flow?

8A

The current flow in a pure capacitive circuit leads the applied voltage by ? .

90°

? is the opposition offered to the flow of current by the reaction of a capacitor.

Capacitive Reactance

? is the opposition to AC current flow caused by a capacitor.

Capacitive Reactance

Select the correct option to complete the following sentences. If the capacitance of a capacitive circuit is ? , the capacitive reactance is increased. If the frequency of a capacitive circuit is ? , the capacitive reactance is decreased.

Decreased Increased

Current flows through a capacitor because of the increase and decrease of voltage and change in the direction of current.

False

When using the formula for calculating capacitive reactance, the frequency must be expressed in hertz and the capacitance in ? .

Farads

The unit of measure for capacitive reactance is the ? .

Ohm

In reality, in a capacitive AC circuit, current only flows back and forth as a result of the increase and decrease in voltage and the change in ? .

Polarity

In a charged capacitor, the voltage across the plates of the capacitor opposes the applied voltage.

True

? is the abbreviation for capacitive reactance.

Xc

Drag the terms below to the appropriate locations to create the formula to find capacitive reactance. Be sure to place the variable of the item you are solving for on the left.

Xc = 1/(2πfC)

Solve for the capacitive reactance and the total current in the circuit shown if the frequency is 200 hertz. Then calculate the values again at 60 hertz. (Round the FINAL answers to at least two decimal places in the specified unit.)

Xc@200 = 1693 It@200 = 3.54mA Xc@60 = 5644Ω It@60 = 1.06mA

Current through a capacitive circuit is ? proportional to the frequency and ? proportional to the voltage.

directly / directly

Select the correct option to complete the following sentences. If the frequency of a capacitive circuit ? , the current is increased. If the voltage of a capacitive circuit ? , the current is increased.

is Increased is Increased