2018-02-14
316
Exercise 1. Read and memorize using a dictionary:
| acid mixture; charging; crank; dissimilar metals; fuel; ignition; lead; lights; power output; sealed; |
Exercise 2. Answer the questions:
1) What is the primary "source" of electrical energy on vehicles?
2) When may the battery energy be needed?
3) Why may the acid strength weaken?
4) What does battery acid consist of?
Exercise 3. Match the left part with the right:
| 1. Today’s batteries are | a) the positive and negative plates. |
| 2. The positive and negative plates are | b) be kept at or near full charge. |
| 3. As a battery discharges, sulfate combines chemically with | c) more durable, have high power-to-weight ratios and lighter cases. |
| 4. To produce maximum cranking power and remain healthy, an automotive lead-acid battery must | d) sandwiched together and separated by a nonconductive insulating layer of paper, plastic or mirco-woven glass. |
Exercise 4. Open brackets choosing the right words:
Lead-acid batteries have been around since the (most/earliest) days of the automobile and have steadily improved over the years. Today’s batteries are more durable, have high power-to-weight ratios and (lighter/heavier) cases. But the basic (chemistry/mathematics) is unchanged. A chemical reaction between two (well-known/dissimilar) metals in an acid solution creates voltage. The two dissimilar metals are lead and lead (gold/peroxide).
