suppose we want to use a laptop to send 100 files of approximately 40MB each to another coumputer over an 11 Mbit/sec Wireless connection. The laptop battery currently holds 100,000 joules of energy. The wireless networking card alone consumes 7 watts while transmitting, while the rest of the laptop always consumes 35 watts. Before each file transfer we need 10 seconds to choose which file to send. How many complete files can we transfer before the laptop's battery runs down to zero? 答案上面写着 传送一个档案所需时间：10s + 40MByte/11Mbit/sec=39.1s 传送一个档案所需功率：10s * 35w + (39.1-10)s * 40w = 1514J ^^^^ 我想问的是哪来的40W ?? 这是高铭老师写再历届试题上的 --

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