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2. Complete the sentences using the correct variant

1. A filter is used in order

a) to separate d.c. from a.c.

b) to transfer energy from the primary to the secondary.

c) to separate low frequencies from high frequencies.

2. A filter consists of

a) a resistor and a transformer.

b) a choke coil and a capacitor.

c) an inductance coil and a capacitor.

3. Direct current easily passes

a) through a choke coil.

b) through a capacitor.

4. Alternating current easily passes

a) through a capacitor.

b) through a choke coil.

5. A low-pass filter is used

a) to pass high frequencies and to prevent the flow of low frequencies.

b) to pass low frequencies and to prevent the flow of high frequencies.

6. In a low-pass filter

a) a capacitor is used as a bypass.

b) an inductance coil is used as a bypass.

7. In a high-pass filter

a) an inductance coil is used as a bypass.

b) a capacitor is used as a bypass.

3. Complete these sentences using on the other hand. Follow the model.

Model: Direct current passes through the choke coil of a filter; alternating current, on the other hand, passes through the capacitor.

1. A low-pass filter is used to pass low frequencies … .

2. In a high-pass filter an inductance coil is used as a bypass … .

3. A high-pass filter is used to prevent the flow of low frequencies … .

4. Alternating current passes through a capacitor … .

4. Answer the following questions:

1. What is a filter used for?

2. What does a filter consist of?

3. What is the function of a low-pass filter?

4. What is the function of a high-pass filter?

5. What is the difference between a low-pass filter and a high-pass filter?

6. What elements are used as a bypass?

7. What is the function of a choke coil?

8. What is the function of an inductance coil?

5. Draw schemes of a choke input filter and a capacity input filter. Describe the schemes and the function of the filters.

6. Read the text and answer the question that follows it.

Choke Input Filter and Capacity Input Filter

rectify

[ˈrektɪfaɪ]

выпрямить

eliminate

[ɪˈlɪmɪneɪt]

устранить

A choke input filter and a capacity input filter are used in rectifiers. Filters of this kind are connected to rectifiers in order to eliminate pulsations produced in rectified current.

1) Choke input filter is a low-pass filter. A choke coil is in series with the rectifier output.

2) Capacity input filter is a high-pass filter. A capacitor is connected directly across or in parallel with the rectifier output.

What is the difference between a choke input filter and a capacity input filter?

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