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- A 2 wire d.c. ring distributor is fed at A with 220 V. The various loads are 10A at B, 20A at C,30A at D and 10A at E. The resistances of the sections AB, BC, DC, DE and EA are 0.1 £2, 0.05 $2, 0.01 2, 0.025 2 and 0.075 respectively. Determine, a. Point of minimum potential b. Current in each section [Ans.: Point C, 29.04 A, 19.04 A, 0.96 A, 30.96 A and 40.96 Awhat is the mathematical relationship between Current and Resistance?10. Explain Kelvin's double bridge method of measurement of resistances. What makes it so powerful and immune to contact and other resistances?
- Ql:- Given a piece of solid copper bus bar as shown in Figure below, determine the resistance between the ends of this bar. - 270 m 150 mm mm Resistivity of copper p= 1.723 x 10-2m Q2:- What is the resistance of a 50 m length of copper wire with a diameter of 2.5 mm? 2.5 mm R=? Resistivity of copper p= 1.723 x 10 .m Q3:- For the circuit shown, determine the number of branches, nodes, and independent loops. 10 2 12 12 ww 62 ww 32 42 52 122 ww wwWhen you are solving for circuit problems from the data obtained from experiments, what is the significance if you got a negative sign from a calculation? a. No significance B. It means you did something wrong on your calculation. C. Real resulting current or voltage is in the opposite direction to one assumed. D. You probably used smaller scaling factor. Explain ty.During the Wheatstone Bridge experiment, when the pointer is at the balance point then: O a. The potential difference across the unknown resistance is equal to the potential difference between the end of the wire connected to the known resistance.the balance point. O b. The potential difference across the known resistance is equal to the potential difference between the balance point and the point of contact between the known andunknown resistances. O c. The potential difference across the unknown resistance is equal to the potential difference across known resistance. O d. The potential difference across the unknown resistance is equal to the potential difference between the balance point and the end of the wire connected to the unknown resistance. O e. The potential difference across the unknown resistance is equal to the potential difference between the balance point and the end of the wire connected to the known resistance. Clear my choice
- QUESTION -8 The plot describing the thermal characteristics of copper wire is given in the figure. Using this plot, for a 1000ft length copper wire with 10 Ω resistance at room temperature (20oC)a) Calculate the resistance value at 100oC.b) Calculate the power consumed in the cable carrying 10A current at this temperature (100oC) in units Watt.c) Calculate the amount of energy consumed in the cable during a day with the conditions in (a) and (b) in units Joules.d) A motor with 600Watt output power that works with 85% efficiency is driven with 10A current carried in the cable at 100oC. Calculate the amount of power transformed (dissipated) into heat in this system.e) Consider that a cooling system is used to cool the cable to 50oC and the cable carries 10A current. How many watts should be the maximum amount of power consumed by the cooling system in order to gain power (consume less total power).Q1.- Estimate the relative error in measuring the unknown resistor when are using the Ammeter- Voltmeter method as in arrangement in tow figures shown below? Which of this arrangement are useful to use? rTwo tram cars (A & B) 3 km and 8 km away from a sub-station return 60 A and 40 A respectively to the rails. The sub-station voltage is 600 V d.c. The resistance of trolley wire is 0.25 ohm/km and that of track is 0-03 ohm/km. Calculate the voltage across each tram car.
- 2. What must be known in order to calculate the energy used by an electrical appliance? a.current and resistance b. voltage and current c.power and time of operation d.current and time of operation 3.Voltage drop is the: a. voltage at the end of a circuitb. maximum potentialc. difference in potential between two pointsd. voltage produced by a sourceExplain the concept of electrical load in the context of a power system. How is it categorized?6. A length of a copper telephone line has a resistance of 24 ohms at 20°C. What is the resistance on a hot summer day when its temperature raised by 26C°? 7. A certain cooper wire has a resistance of 25 ohms at 10°C. Take the temperature coefficient at 10°C to be 0.00409/°C. What must be the maximum operating temperature of the wire if its resistance is to increase by most 30%? 8. The resistivity of iron at 0°C and 12°C is 8.68 x 10 *0-m and 9.75x 10 -8 N-m respectively. Calculate the resistivity at 35°C 9. One meter rod of 2 inches diameter is drawn until its resistance is 100 times the initial resistance. Its length afterward is? 10. The substation bus bar is made up of 1.5 inches round copper bars 30 ft long. What is the resistance of each bar? 11. What is the color code for a 8KQ, tolerance + 10% resistor? 12. Find the nominal value of the resistance of the resistor shown.