Mention the minimum branch-circuit rating for the demand range of 8 3 4 kW or higher.

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Three types of electric devices A, B, and C are connected in series across a 115-volt a-c source, and the voltage drops across the individual units are equal. If Eв leads EA by 90 electrical! degrees_____Ec______behind Ex by 90 electrical degrees, what are the emfs across A,B,and C?

Answer 1

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Chapter 20.2, Problem 13R

To determine

Mention the minimum branch-circuit rating for the demand range of 834 kW or higher.

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Three types of electric devices A, B, and C are connected in series across a 115-volt a-c source, and the voltage drops across the individual units are equal. If Eв leads EA by 90 electrical! degrees_____Ec______behind Ex by 90 electrical degrees, what are the emfs across A,B,and C?

Connect the initial circuit as shown in Figure 47-1.2. Set VA at 20 volts. Insert a jumper wire between points A and B and observe the meter action.OBSERVATION Current flowed for approximately ___________ seconds as evidenced by the voltagemeasured across R. The rate of charge was (linear, nonlinear) __________________.nCONCLUSION The current that flowed was the charging current that charged the capacitor to avoltage equal to (VR, VA) ____________________. Was charging current maximum atthe beginning of the charge time or near the end? _________. At the beginning of thecharge time, the voltage across R was equal to (VC , VA) _______________________(the first instant). At the end of the charge time, the voltage across the resistor is________ volts; the voltage across the capacitor is equal to VA.

1. A14/2 type copper used for a general lighting branch circuit. Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 2.Three 8 AWG copper conductors with THHN insulation Installed in garage in electrical metallic tubing (EMT). The ambient temperature in the garage can reach as high as 110'F. All termination points for this circuit are rated 60'C. Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 3.Four 4 AWG copper conductor with THWN insulation imstalled in EMT in a basement. All termination points are rated at 60'C. Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 4. An 8/3 Type UF copper cable installed underground from a house to a detached garage to feed a 120/240-volt subpanel. All termination points are rated at 60'C.…