國中教甄｜生活科技生活科技109 年第 62 題單選題
Which of the following statement is incorrect?
AThe role of the fuse in the circuit is to avoid excessive voltage.正確答案
BIf the length is the same, a wire with a larger cross-sectional area can withstand a larger current.
CThe fuse installed in the circuit or electrical appliance is a metal alloy wire with a low melting point and a large resistance.
DHousehold electricity is parallel circuit.
A正確答案
保險絲的作用是防止電流過大而非電壓過大，故選項A敘述錯誤。
逐選項解析
AThe role of the fuse in the circuit is to avoid excessive voltage.✓ 正確
保險絲串聯於電路中，當電流超過安全限值時，會因電流熱效應而熔斷以切斷電路，其功能是避免「過大電流」而非「過大電壓」。
BIf the length is the same, a wire with a larger cross-sectional area can withstand a larger current.✕ 錯誤
導線長度相同時，截面積越大則電阻越小，且散熱效果較佳，因此能承受的安全電流（容許電流）越大，此敘述正確。
CThe fuse installed in the circuit or electrical appliance is a metal alloy wire with a low melting point and a large resistance.✕ 錯誤
DHousehold electricity is parallel circuit.✕ 錯誤
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