下圖顯示了一個邏輯門的符號。當輸入端 \(A=0\) 且 \(B=1\) 時,其輸出端 \(Y\) 的邏輯值為 \(1\)。請問這是哪種邏輯門?
Senior Secondary (HKDSE) · Design and Applied Technology
Electronic signals, devices and circuits: Practice Questions
5 multiple-choice questions marked as you go, and 2 written questions with worked solutions. All on Electronic signals, devices and circuits.
一個電路包含一個12V電源和兩個並聯連接的電阻器。如果第一個電阻器的電阻是\(R_1 = 300 \, \Omega\),第二個電阻器的電阻是\(R_2 = 600 \, \Omega\),請問流經該電路的總電流是多少?
下圖顯示了一個使用運算放大器(Op-Amp)作為電壓比較器的溫度報警電路。其反相輸入端連接到一個 \(6V\) 的參考電壓,而同相輸入端連接到一個由 \(12V\) 電源、負溫度系數(NTC)熱敏電阻(位於上方)和固定電阻器 \(R_1\)(位於下方)組成的分壓器。當環境溫度顯著上升時,下列哪一項描述是正確的?
在電子電路中,根據歐姆定律(Ohm's Law),若一個電阻器兩端的電位差(電壓)為 \(9V\),流經它的電流為 \(0.03A\),則該電阻器的電阻值是多少?
下圖顯示了一個由固定電阻器 \(R_1\) 和光敏電阻(LDR)組成的分壓器電路。輸出電壓 \(V_{out}\) 是在 LDR 兩端量取的。當環境光線亮度顯著增加時,下列哪一項描述是正確的?
根據歐姆定律,在一個簡單的電子電路中,若維持電阻器的阻值不變,而將跨於其兩端的電壓增加至原來的兩倍,請說明該電阻器所消耗的功率(Power)會發生什麼變化。
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一個簡單電路包含一個 12 V 的直流電源和兩個串聯的電阻器:$$R_1 = 100\text{ }\Omega$$ 和 $$R_2 = 200\text{ }\Omega$$。
(a) 請計算電路中的總電阻。$$R_{\text{total}} = R_1 + R_2$$
(b) 請計算流過電路中的總電流。$$I = \frac{V}{R_{\text{total}}}$$
(c) 請計算電阻器 $$R_1$$ 兩端的電壓。$$V_1 = IR_1$$
(d) 請計算電阻器 $$R_2$$ 所消耗的功率。$$P_2 = I^2R_2$$ 或 $$P_2 = \frac{V_2^2}{R_2}$$ 或 $$P_2 = V_2I$$
Write your answer out first, then check it against the worked solution.
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