The following three questions refer to the figure below. a) Calculate the current through R₂. E1 O a. 0.51 O b. 0.26 O c.0.34 O d. 1.03 R₁ ww ww Use the following values: &,-8.1 V, ₂-6 V, R=R₂=7.90 and R₂ =2R₂. Enter your answer accurate to two decimals figures. E2 R₂ www R3 a b|
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- An electric device draws 6.10 AA at 240 VV. If the voltage drops by 25 %, what will be current, assuming nothing else changes? Express your answer to two significant figures and include the appropriate units. I final= If the resistance of the device were reduced by 25 %, what current would be drawn at 240 VV? Express your answer to two significant figures and include the appropriate units. I final=A TV works properly under the voltage of 4V= 110 V with power P = 1560 W. Express the current I through the power P and the voltage AV. I = Calculate the working current of the TV in A. I = Express the resistance R through the voltage AV and the current I. R = |Calculate the numerical value of R in 2. R =For the circuit shown in the figure below, determine voltages (voltage drops) Vị, V2 , absolute voltage Va at node a versus ground, and circuit current I. Express voltages in volts and current in milliamperes. Keep three significant digits. You are given Vs = 10 V. + + V, - 8 kO a + 14 4 kΩ. V2 Vs 4 ΚΩΣ OV -
- What is the current through 14V battery if you replace R1 resistor by 8 Ohm, R, resistor by 11 Ohm and R3 resistor by 2 Ohm? Your result must contain two decimal figures. Use the current directions as they are in the picture. (That means your result can be negative) Maximum of 3% of error is accepted in your answer. 14 V R, R2 10 V R3a) Refer to Figure 4, determine: i. The current, I ii. The output voltage at Vol and Vo2 Ge 5.8 ko 10 V Vo2 o Vo1 Si Figure 4Solve the following: 1. How many nanocoulomb are there in 3.65 billion electrons ? 2. A 25 ampere electric current flows in a conductor in 75 millisecond. Find: a. current equivalent in mA? b. How many charges are transferred ? c. How much work is required to transfer if 3V is applied. 3. A charge of 3.5 µC present in an electric field produces a force of 0.008 Newton. What is the intensity of the electric field ? 4. A charge of 0.6 µC is placed in an electrostatic field whose intensity is 3 x 105 N/C. How strong is the force acting on the charge ? 5. Two objects are both negatively charge with 0.04 coulomb each and 140 cm apart. What kind of force exist Between charges? How much? 6. Find the force that exist between two charges of 8.53 μC and 4.5 µC that 0.25 meters in air?
- HW Q1.Nichrome wire has resistivity p=1.5*106 (Q.m) calculate the following a. The resistance per unit length if the radius of wire is 0.321 mm? R-4.6 Ωm b. If the potential difference of 10 V is maintained across a 10m length of Nichrom wire ,what is the current ? I=2.2A Q2Silver wire with cross section area 0.923mm2 , the resistivity = 10.49g/cm and the molar mass M=107.9g/mol, if the current pass though the wire is 0.123mA, calculate : 1.The electron density 2.The current density 3.Drift speed (va=1.42*10-3 m/s) %3D (n=5.855*1028 e/m') (j-133.26A/m2 ) Q3.a.Calculate the current density for Aluminum wire has radius 1mm and current 1mA? 318.31A/m? b. Calculate the drift speed for electrons in the wire ? 3.29*108 m/s if the pAL-2.7*10 kg/m3 and if you know that one mole in the Aluminum has mass equal to 26.98g and there is one conduction for each Aluminum atome?Use "E" as the symbol for Voltage. R, R, 3. If I = 0.75 A, R1 = 6 Q, and R2 = 15 Q, what is.. a. the voltage across R1? : b. the voltage across R2? : c.the voltage of the battery?! :: 4.5 V : 11.3 V :: 15.8 V :: 6.8 V :: 2.7 V : 9.7 VThe resistance of gold wire used in circuits is usually negligible compared to the components in the circuit, and can be ignored. For long, thin wires, this is no longer true. Calculate the resistance, in ohms, of a length of gold wire, 46.6 cm long, with a cross sectional area of 2.5 mm2. The resistivity of gold is 2.35×10-8 Ω.m. Use 2 significant figures in your answer.
- R = Two identical resistors of Ro= 41 Q are connected head-to-tail. www Express the resistance Ro of one of the resistors in terms of the resistivity p, length L, and the cross section area A. Calculate the total resistance R of the two resistors in ohms. R RA rod of length 2.3 m, with a rectangular cross section (1.5mm x 3.0 mm) is made ofa material with a resistivity of 6.1 × 10^-8 Ohm. A potential difference of 5.0 V isplaces across the ends of the rod.a. Draw a clear physics diagram of the problem.b. At what initial rate is heat generated in the rod?c. Will the rate from part (b) increase, decrease, or remain constantover time, as the rod remains connected to the 2.5 V potential difference?Explain brieflyQ1.Nichrome wire has resistivity p-1.5*10-6 (Q.m) calculate the following a. The resistance per unit length if the radius of wire is 0.321 mm? R=4.6 Q/m b. If the potential difference of 10 V is maintained across a 10m length of Nichrom wire ,what is the current ? I=2.2A