题型:阅读理解 题类:常考题 难易度:普通
山西省晋中市2018-2019学年高二上学期英语期末考试试卷
Whether you're on a long road trip or stuck in traffic while driving home from work, a low phone battery (电池) could mean disaster for the bored driver. At first, it may seem harmless to plug your phone into your car's USB port. But unless you're desperate, charging your phone in your car might be a big mistake.
Why? First, the USB port in your vehicle probably provides less electricity than your phone really needs to charge. As a result, your phone might stop working while it charges, or worse—hardly charge at all.
Brad Nichols, a technician at Staymobile, told Reader's Digest. “This is mostly due to the fact the phone is using more power than the car charger is supplying it.”
Nichols also says that your phone could receive too much power, especially if you're using a “Cigarette Lighter” port to charge up. Most Cigarette Lighters can supply up to 10 amps (安培), while most chargers use one to three amps. A damaged charger can provide inconsistent power to the phone, leading to sudden power increase that could cause damage to the inside parts, or on the rare occasion, destroy it.
Charging your phone while on the road could use up your car's battery, too. If your engine is off, but you still use the radio—the phone will draw power from your car's battery as it charges. This usually isn't a big deal for those who own new cars with healthy batteries Nichols says. But if your car is an older model, you might want to avoid charging your phone through its USB port.
Most importantly, it, s not safe to use your phone while operating a vehicle. “Anytime a person's hands leave the wheel or eyes leave the road, it becomes very dangerous for them and the other people around them,” Nichols says. Bottom line: Play it safe, and wait until you get home to plug in.
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