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5. 如圖所示,若電流 I 等於零,則電阻 R 為多少歐姆? (A) 1.5Ω (B) 3Ω (C) 6Ω (D)9Ω
問題詳情
5. 如圖所示,若電流 I 等於零,則電阻 R 為多少歐姆?
(A) 1.5Ω
(B) 3Ω
(C) 6Ω
(D)9Ω
參考答案
答案:B
統計:A:0,B:0,C:0,D:0,E:0
難度:計算中
上一篇 :
4. 兩個電熱絲的電阻值都是 5 Ω,但是標定的規格分別是 5 W 與 20 W,如果將他們串聯,串聯後所能運作的最大功率是? (A) 5 W (B) 10 W (C) 20 W (D) 25 W。
下一篇 :
9. 關於電壓表之敘述,以下選項何者有誤? (A)與負載並聯後可測電壓 (B)與高電阻器並聯後 可測更高電壓 (C)其內阻大於電流表內阻 (D)與高電阻器串聯後可測更高電壓。
資訊推薦
10. 一個放大器若加入負回授形成串並回授放大器後,其輸入阻抗有何變化? (A)沒變 (B)變小 (C)變大 (D)無法判斷。
11. 史密特觸發器(Schmitt trigger)之輸入信號不論為何種波形,其輸出波形皆為何種波形? (A)脈波 (B)鋸齒波 (C)正弦波 (D)三角波。
12. 如下圖所示電路,應該屬於以下何種回授放大器(feedback amplifier)之架構? (A)串串 (series-series) (B)串並(series-shunt) (C)並串(sh
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6. 有一電阻、電容串聯的電路,接上交流電源,v(t) = sin(377t) V,電源電流是 i(t) = sin(377t+ 60°) A。請問這電路的虛功率是多少 VAR? (A)(B) 0
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7. 有一電阻、電容並聯的電路,接上交流電源,在電壓峰值不變,以及電路正常運作的條件下, 如果把電源頻率從低變高,那麼以下哪一個敘述是正確的? (A)電路的功率因數會降低 (B)電 容的電抗會升高 (
8. 一顆 10 W 的 LED 燈泡點亮 24 小時,會讓電錶讀數增加幾度? (A) 0.1 度 (B) 240 度 (C) 0.24 度 (D) 10 度。
9. 有一個行動電源標記著 6000 mAh,如果電量從 0% 充電到 100%,歷時 4 小時,請問平均的充電電流是多少? (A) 1.5 A (B) 6 A (C) 0.6 A (D) 0.15
10. 交流電路裡一個 10 μF 的電容器,如果電容器的兩端的電壓是 100 sin(377t) V,請問電容的平均功率是多少? (A) 76 W (B) 38 W (C) 0 W (D) 19 W
4. Which statement below is inaccurate? (A) II is thermodynamics property and I is kinetics relevant