Appendix 1 Grammar Exercises

I. Simple Tenses (Active/Passive)

1. Make the following sentences negative and translate them:

1. It is difficult to differentiate between those methods.

2. The value of this resistor is constant.

3. These electrodes are of the same material.

4. That element is a capacitor in the circuit.

5. These materials are insulators.

6. This invention is of great importance.

7. This is a special device to measure the current.

2. Ask general questions and give the short answers:

1. The flow of electrons through a conductor is similar to the flow of water.

2. The practical unit of current is the ampere.

3. The ohm is the practical unit of resistance.

4. The resistance of a conductor is proportional to its length.

5. Series and parallel circuits are the most important.

6. These sources of current are primary batteries.

7. The portion of a wave above the zero current is the positive half cycle.

8. The period is the time required for one cycle of current.

9. Inductance, capacitance and resistance are the circuit constants.

10. These examples are illustrations.

3. Make the following sentences negative and interrogative and translate them:

1. There are various kinds of electric current here.

2. There is an electric current in that conductor.

3. There is a trouble in the main line.

4. There are some orbits in this atom.

5. There are five main parts in this complicated device.

4. Put the sentences in the Past and Future Simple Tense:

1. There are many types of computers.

2. An electronic computer is a large complex device.

3. There are some kinds of electron tubes in use.

4. A capacitor is one of the main elements of a circuit.

5. The function of insulators is to isolate the metal plates and to prevent a short.

6. The most common meters are the ohmmeter, the voltmeter, and the ammeter.

5. Ask all possible kinds of questions:

1. All substances have some ability to conduct the electric current.

2. A modulated current has variable amplitude.

3. An electronic computer has five main parts.

4. A pentode has two electrodes and three grids.

5. That cubic lattice has atoms at the corners and at the centre of the cube.

6. Variable capacitors have air insulators.

7. When a capacitor has a trouble it does not store energy.

6. Make the sentences negative and translate them:

1. That apparatus has moving parts.

2. These instruments have large scales.

3. The current transformer will have about 160 turns in the secondary winding.

4. These instruments have two moving coils.

5. That machine had some disadvantages some months ago.

7. Put the sentences in the Past and Future Simple Tense:

1. Computers perform mathematical operations at a very high speed.

2. That unit takes the coded instructions.

3. A reader converts information into pulse form.

4. That electronic computer forms a large complicated device.

5. We use these electronic computers in research and industrial work due to their exactness and speed.

6. The engineer controls the electric current at the plant.

7. The electrons move from one part of metal to another.

8. The movement of electrons occurs very easily through conductors.

9. We define this unit from the relation between the difference of potential and the current in the conductor.