A current of 5 amperes enters a parallel combination of two unequal, unknown resistors (R1 and R2 supplied from a 45 volts DC source. If the two resistors are connected in series, the current drawr from the same source decreases to 937.5 mA. R1 has a lesser resistance than R2. Find R1 and R2
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- You are working as an electrician in a large steel manufacturing plant, and you are in the process of doing preventive maintenance on a large DC generator. You have megged both the series and shunt field windings and found that each has over 10 M to ground. Your ohmmeter, however, indicates a resistance of 1.5 across terminals S1andS2. The ohmmeter indicates a resistance of 225 between terminals F1andF2. Are these readings normal for this type machine, or is there a likely problem? Explain your answer.For the circuit shown, determine the equivalent voltage source in Volts where I1=8 A, I2=2 A, R1=12 Ω, and R2=28 Ω. (i.e. What voltage source should be in series with the a resister to create an equivalent circuit?)In the figure is shown a battery having an emf of 12 Volts and an internal resistance of 0.40 Ohm. A resistor R1 of 2.6 Ohms is connected across its terminals ab. Determine (a) resistance of R which, when connected across terminals ab in parallel with R1 will make the power delivered by the battery a maximum; (b) current in R1 and R; (c) terminal voltage of battery; (d) power in R1 and in R; (e) power lost in battery Hint: To maximize power in R, use differentiation.
- 4. The heating element in an oven has a resistance of R =32 ohms. One of thewires connecting the oven to the 220 volt power source is loose, contributingan additional r = 5 ohms to the closed-loop circuit. What is the power Povenradiated in the oven, and what is the rate Pcontact at which heat is dissipatedat the loose contact? The looser is the connection, the greater is the resistance r: What value of r is most likely to cause a fire. Also agraph showing Pcontact versus rone turn of a copper bar is produced by cutting copper washer along a radius and spreading the ends. The washer is cut from soft drawn copper having a resistivity at 20 degrees celsiu of 1.732 micro ohm-cm. The washer is 0.125 inch thich and has inside diameter and outside dianmeter of 1 inch and 9 inches respectively. Calculate the exact resistance between the two end of the turn. Assume the contact along the ends of the turn to be perfect over the entire crown section.Two ideal batteries with zero internal resistance and five resistors connected as shown in the diagram. The resistances of resistors are known, the electromotive force of one battery, and it is known that a current of I1 = 3A flows through the resistor R1. Calculate the electromotive force of the battery E2
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- consider the following circuit composed of four resistors and an ideal battery. each resistor has a resistance of 2.00 ohms. the battery has a terminal voltage of 30.0V. a.) what is the equivalent resistance of this circuit? b.) what is the equivalent current passing through this circuit? c.) what is the voltage drop across R1? d.) what is the current passing through R2?What is the voltage of UR1 falling on the resistor R1 in the circuit given in the figure?An electric circuit consists of four resistors, R1 = 12 Ohm, R2 = 1 2 Ohm, R3= 3 ohms and R4 = 6 Ohm, are connected with source of emf E1 = 6 Volt, E2 = 12 Volt. Determine the electric current flows in the circuit as shown in figure below.