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Worksheetsphy_4.2.2_voltage 電壓
Total questions: 10
Worksheet time: 2hrs 16mins
電動勢定義為
Electromotive force is defined as
當一個單位的電荷通過電源時，電源供應給該單位電荷的電能。
the electrical energy imparted by a source per unit charge passing through the source.
在每一單位時間內，電源供應給通過電源的電荷的電能。
the electrical energy imparted by a source on the charges passing through the source per unit time.
當一個單位的電荷通過電源時，被轉換成其他形式的能量的電能。
the electrical energy changed to other forms of energy per unit charge passing through a source.
在每一單位時間內，被轉換成其他形式的能量的電能。
the electrical energy changed to other forms of energy on the charges passing through a source per unit time.
以下哪項是電動勢的單位？
Which of the following is/are the unit of electromotive force?
(1) N
(2) J C−1
(3) V
只有 (1)
只有 (3)
只有 (1) 和 (2)
只有 (2) 和 (3)
把1 V電池組連接至電阻器，下列哪項敘述是正確的？
A 1-V battery is connected to a resistor. Which of the following statements is correct?
每當0.5 C的電荷流經電池組，就有0.5 J的電勢能轉換成其他能量形式。
When 0.5 C of charge passes through the battery, 0.5 J of the electric potential energy is converted to other forms of energy.
每當0.5 C的電荷流經電池組，就有2 J的電勢能轉換成其他能量形式。
When 0.5 C of charge passes through the battery, 2 J of the electric potential energy is converted to other forms of energy.
每當0.5 C的電荷流經電阻器，就有0.5 J的電勢能轉換成其他能量形式。
When 0.5 C of charge passes through the resistor, 0.5 J of the electric potential energy is converted to other forms of energy.
每當0.5 C的電荷流經電阻器，就有2 J的電勢能轉換成其他能量形式。
When 0.5 C of charge passes through the resistor, 2 J of the electric potential energy is converted to other forms of energy.
圖中顯示電路中某部分的「山形圖」。山形圖中，圖線的高度代表甚麼？
The following shows a ‘hill diagram’ of part of a circuit. What does the height of the diagram represent?
電子的勢能
Potential energy of electrons
電子的動能
Kinetic energy of electrons
正電荷的勢能
Potential energy of positive charges
正電荷的動能
Kinetic energy of positive charges
若電量為6 C的電荷流經電池後獲得了12 J能量，電池兩端的電壓是多少？
When 6 C of charge passes through a cell, 12 J of energy is supplied to the charge. What is the voltage across the cell?
0.5 V
2 V
6 V
12 V
若3 x 1019粒電子通過電池組後獲得了18 J能量，電池組兩端的電壓是多少？（已知：電子的電量 = -1.6 x 10-19 C）
When 3 x 1019 electrons pass through a battery, 18 J of energy is supplied to the them. What is the voltage across the battery? (Given: charge of an electron = -1.6 x 10-19 C)
3.75 V
4.8 V
7.5 V
18 V
一尾電鰻能夠產生500 V的電壓及1 A的電流。在五秒內所轉移的電能是多少？
An electric eel can produce a shock at up to 500 V, and 1 A of current. What is the electrical energy transformed in 5 s?
100 J
500 J
2500 J
無法計算
It cannot be determined.
一個12 V的電池組輸出150 A的電流。在兩分鐘內，所轉換的電能是多少？
A total current of 150 A is drawn from a 12 V battery. What is the electrical energy transformed in 2 minutes?
1.8 × 103 J
3.6 × 103 J
1.08 × 105 J
2.16 × 105 J
當一個電水煲接駁至220 V的市電插座時，流經電水煲的電流是6 A。假如電水煲開啟了10分鐘，轉移至電水煲的能量是多少？
An electric kettle connected to 220 V mains draws a current of 6 A from the socket. What is the amount of energy transferred to the kettle if it is switched on for 10 minutes?
366 J
13.2 kJ
22 kJ
792 kJ
一名學生利用一個12 V浸沒式電熱器把0.2 kg的水加熱10分鐘，而流經電熱器的電流為4 A。假設沒有能量散失至四周，水溫上升了多少？已知水的比熱容量是4200 J kg−1 °C−1。
A 12 V immersion heater is used to heat up 0.2 kg of water for 10 minutes. The current flowing through the heater is 4 A. Assuming that there is no heat loss to the surroundings, what is the increase in water temperature?
(The specific heat capacity of water is 4200 J kg−1 °C−1.)
6.9°C
17.1°C
27.6°C
34.3°C
