Filters

This filter is used to separate direct current from alternating current. It consists of a capacitor and a choke coil. Direct current cannot flow through a capacitor since its insulators oppose the flow of direct current. Therefore, it flows through the choke coil. Its windings easily pass direct current through them. Alternating current, on the other current, passes through the capacitor, since it cannot easily pass through the choke coil. In this way the direct and the alternating currents are separated.

A high pass filter is to pass high frequencies and prevent the flow of low frequencies. It consists of a condenser and an inductance coil. The condenser passes currents of high frequencies and opposes the flow of low frequencies currents.

1. What is the main function of the filter?

2. What does a filter do when it operates?

3. What is the difference between high pass and low pass filters?

2. Find the correct variant.

A pentode contains

a) the cathode, the plate, two screen grids and the suppressor grid

b) the cathode, the plate, the control grids, the screen grids, and the suppressor grid

2. the function of the cathode is

a) to collect electrons

b) to eliminate the secondary emission

c) to emit electrons

3. the function of the screen grid is

a) to collect electrons

b) to reduce the capacity

c) to eliminate oscillations

4. a triode contains

a) the cathode, the plate and the screen grid

b) the cathode, the plate and the control grid

5. the function of the plate is

a) to eliminate oscillations

b) to emit electrons

c) to collect electrons

3. Make up sentences, using words and word-combinations.

An amplifier, output voltage, input voltage, are connected, opposite ends, input transformer, is connected, maximum grid voltage, minimum grid voltage, remain, constant.

Additional material for card № 12

1. Read the text, translate it and answer the questions.

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