Text c an argument against circuit brakers

There’s some controversy among electrical experts whether fuses or circuit breakers are better. Those favouring fuses mention several drawbacks of circuit breakers. One is the higher cost. A more important one, though, is the automatic-reset function on many circuit breakers, which appears at first to be a strong positive feature.

Opponents of circuit breakers rightfully point out that after on automatic-reset circuit breaker cools, it permits current to flow again. If the cause of the overload is still there — and it probably will be — the circuit breaker again heats up and breaks the circuit. This on-off-on-off cycle repeals until the problem is corrected. Unfortunately, during the on time, current flows unimpeded. If the circuit breaker's trip point is too high, the ‘on’ periods may be long enough to overheat the wiring, just as though there were no circuit protection. Opponents of circuit breakers consider this a major safely hazard. They may be right.

The use of circuit breakers in place of fuses calls for some common sense, if you notice an on-off cycle occurring, immediately shut down the affected circuit, then find and correct the problem before using the circuit again.

The idea that circuit breakers pose a major safety hazard can be countered by noting that almost all OEM headlamp circuits are protected by an auto-reset circuit breaker in the headlamp switch. The theory here is that it's better to have flickering headlamps than to suddenly have none.

It all boils down to choice. If you think you're likely to ignore the intermittent warnings of auto-reset circuit breakers, use fuses and carry sufficient spares. Or, in some circuits, you may be able to use the type of circuit brewer that resets manually by means of a toggle switch. These are the type used on race cars, and are readily available. On the other hand, if you've gained enough experience to wire a car from scratch, you can probably deal with auto-reset circuit breakers and benefit from the unique protection they offer.

Exercises Unit 7 (text c)

Use the verb in Present Simple, in Passive or Active Voice.

1. The power (measure) by kilowatts or horsepowers.

2. Tracks (increase) the grip of the tractor on the ground.

3. The regular servicing of tractors (provide) useful work.

4. The cylinder and the cylinder heads (form) the combustion chamber.

5. Crawlers (use) for heavy operation.

6. The camshaft (open) the valves of the engine.

7. The oil (change) regularly.

Translate the following sentences into Ukrainian.

І. The manufacturer of the tractor recommends the differential and final drive should be refilled after each 1.200 hours of use. 2. The heat the internal combustion engines produce inside the cylinder is converted into useful power. 3. Lubricating oil tractor-drivers use helps to cool the engine but its main purpose is to reduce the effects of friction. 4. All the farmers know four-wheel drive tractors have an improved pulling power as compared with two-wheel drive. 5. Designers of tractor engines think the efficiency of the engine depends on the portion of heat changed into useful power. 6. Warning lights (сигнальні лампочки) on the instrument panel show there is a fault in the lubricating or ignition systems. 7. The tractor-driver must know the fuel system the engine is equipped with in order to service it properly.

Translate the following sentences into Ukrainian.

1. We know the number of their mine very well. 2. There was a large number of miners at the meeting. 3. They put the lecturer a number of questions. 4. The miners found that the number of deep wells is rather great in their region. 5. Hydrogen is the only element having one electron in its atom. 6. A hydrogen atom has only one electron. 7. It is not easy to solve this question. 8. The scientists have not yet solved this problem. 9. This substance is easily solved in water. 10. The solution of the problem required much time. 11. You must use a water solution of this substance for your experiment.