ILMU FISIKA Oleh : Mukhtar Effendi

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1 ILMU FISIKA Oleh : Mukhtar Effendi
Program Studi Agroteknologi, Fakultas Pertanian Unsoed Oleh : Mukhtar Effendi

2 Electric Current Mukhtar Effendi Ilmu Fisika

3 Microscopic Model of Current
cross-sectional area A length x Volume is A x n represents the number of mobile charge carriers per unit volume Mukhtar Effendi Ilmu Fisika

4 The 12-gauge copper wire in a typical residential building
has a cross-sectional area of 3.31 x m2. If it carries a current of 10.0 A, what is the drift speed of the electrons? Assume that each copper atom contributes one free electron to the current. The density of copper is 8.95 g/cm3. molar mass of copper is 63.5 g/mol 1 mol of any substance contains Avogadro’s number of atoms (6.02 x 1023) Knowing the density of copper, we can calculate the volume occupied by 63.5 g (=1 mol) of copper: Mukhtar Effendi Ilmu Fisika

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6 Resistance the four colors on the circled resistors are red (=2), black (=0), orange (= 103), and gold (=5%), resistance value is 20 x 103 = 20 k with a tolerance value of 5% = 1 k . Mukhtar Effendi Ilmu Fisika

7 Calculate the resistance of an aluminum cylinder that
has a length of 10.0 cm and a cross-sectional area of 2.00 x 10-4 m2. Repeat the calculation for a cylinder of the same dimensions and made of glass having a resistivity of 3.0 x 1010  m. Hitunglah nilai hambatan silinder aluminium yang panjangnya 10 cm dan tampang lintangnya 2 x 10-4m2. Hitung pula silinder gelas yang memiliki dimensi yang sama, yang hambat jenisnya sebesar 3 x 1010  m Mukhtar Effendi Ilmu Fisika

8 the resistance of the aluminum cylinder
for glass Mukhtar Effendi Ilmu Fisika

9 Resistance and Temperature
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10 the temperature of the melting indium sample, is 157°C.
A resistance thermometer, which measures temperature by measuring the change in resistance of a conductor, is made from platinum and has a resistance of 50.0  at 20.0°C. When immersed in a vessel containing melting indium, its resistance increases to 76.8 . Calculate the melting point of the indium. Sebuah termometer mengukur suhu dengan cara mengukur perubahan hambatan dari sebuah penghantar yang terbuat dari platinum yang memiliki hambatan 50  pada suhu 20 C. Pada saat penghantar tersebut dimasukkan ke dalam wadah yang berisi indium cair, hambatannya meningkat menjadi 76,8 . Hitunglah titik leleh indium. the temperature of the melting indium sample, is 157°C. Mukhtar Effendi Ilmu Fisika

11 Electrical Power Mukhtar Effendi Ilmu Fisika

12 An electric heater is constructed by applying a potential
difference of 120 V to a Nichrome wire that has a total resistance of 8.00 . Find the current carried by the wire and the power rating of the heater. Sebuah pemanas listrik dibuat dengan menggunakan beda potensial sebesar 120 V pada sebuah kawat Nikrom yang memiliki hambatan 8 . Hitunglah arus yang mengalir pada kawat tersebut dan daya yang muncul. Mukhtar Effendi Ilmu Fisika

13 Electromotive Force Mukhtar Effendi Ilmu Fisika

14 A battery has an emf of 12.0 V and an internal resistance of
0.05 . Its terminals are connected to a load resistance of 3.00  . (A) Find the current in the circuit and the terminal voltage of the battery. Mukhtar Effendi Ilmu Fisika

15 (B) Calculate the power delivered to the load resistor, the
power delivered to the internal resistance of the battery, and the power delivered by the battery. the power delivered by the battery is the sum of these quantities, or 47.1 W. Mukhtar Effendi Ilmu Fisika

16 Resistors in Series and Parallel
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17 Consider five resistors connected as shown in Figure below.
Find the equivalent resistance between points a and b. Mukhtar Effendi Ilmu Fisika

18 (A) Under steady-state conditions, find the unknown currents
I1, I2, and I3 in the multiloop circuit shown in Figure below. Mukhtar Effendi Ilmu Fisika

19 (B) What is the charge on the capacitor?
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20 Discharging a Capacitor
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26 Sebuah kawat penghantar yang hambat jenisnya  panjangnya l dan luas penampangnya A, dipotong menjadi 3 yang sama panjangnya. Ketiga batang kawat penghantar tersebut diikat menjadi satu sehingga membentuk suatu penghantar yang baru. Berapakah hambatan kawat penghantar yang baru, nyatakan dengan R, jika R adalah hambatan kawat sebelum dipotong-potong. Mukhtar Effendi Ilmu Fisika