本题目来源于试卷: DC Circuits，类别为 IB物理学
[问答题]
Explain why an ideal ammeter would 3oj(.r(q 2wuv puy8n fogx.u+ have zero resistance and an iarf 0u.y jm),di+c9qpdeal voltmeter infini+ a.ryu,jdi)0 cm q9pfte resistance.
参考答案: An ideal ammeter would have zero
resistance so that there was no voltage drop across it, and so it would not
affect a circuit into which it was placed in parallel. A zero resistance will not change the
resistance of a circuit if placed in series, and hence would not change the
current in the circuit. An ideal
voltmeter would have infinite resistance so that it would draw no current, and
thus would not affect a circuit into which it was placed in parallel. An infinite resistance will not change the
resistance of a circuit if placed in parallel, and hence would not change the
current in the circuit.
本题详细解析:
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