vb.net barcode reader code Calculate the apparent power, real power, and in Software

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715 Calculate the apparent power, real power, and
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reactive power for the circuit shown in Figure P715 Draw the power triangle
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712 Find the real and reactive power supplied by the
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source in the circuit shown in Figure P712
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716 A single-phase motor draws 220 W at a power
factor of 80 percent (lagging) when connected across a 200-V, 60-Hz source A capacitor is connected in parallel with the load to give a unity power factor, as shown in Figure P716 Find the required capacitance
Figure P712
713 For the circuit shown in Figure P713, nd the real
and reactive power supplied by each source The sources are Vs1 = 36 /3 V and Vs2 = 24 0644 V
V 8 ~ V1 + S ~ j6 6 j12 ~ + V ~ S2
I I1 I2 R C L
Figure P716 Figure P713
717 Suppose that the electricity in your home has gone 714 The load ZL in the circuit of Figure P714 consists
of a 25- resistor in parallel with a 100- F capacitor Assume = 377 rad/s Calculate a The apparent power delivered to the load b The apparent power supplied by the source c The power factor of the load out and the power company will not be able to have you hooked up again for several days The freezer in the basement contains several hundred dollars worth of food that you cannot afford to let spoil You have also been experiencing very hot, humid weather and would like to keep one room air-conditioned with a window air conditioner, as well as run the refrigerator in your kitchen When the appliances are on, they
7
AC Power
draw the following currents (all values are rms): Air conditioner: Freezer: Refrigerator: 96 A @ 120 V pf = 090 (lagging) 42 A @ 120 V pf = 087 (lagging) 35 A @ 120 V pf = 080 (lagging)
c The power factor angle and the power factor Vs = 7 0873 V Is = 13 0349 A
722 Determine C so that the plant power factor of
Figure P722 is corrected to 1; ie, Is is minimized and o in phase with V vs (t) = 450 cos( t) V Z = 7 + j1 ZG = 3 + j 011 m
~ Is ZG C
+ ~ _ V s
= 377 rad/s
In the worst-case scenario, how much power must an emergency generator supply
718 The load on a single-phase three-wire system in a
home is generally not balanced For the system shown in Figure P718, let Vs1 = 115 0 Vrms and s2 = 115 0 Vrms Determine: V a The total average power delivered to the connected loads: ZL1 , ZL2 , and ZL3 b The total average power lost in the lines: Zg1 , Zg2 , and Zn c The average power supplied by each source
Zg1 = 01
~ V o
Power plant
Plant
Figure P722
723 Determine C so that the plant power factor of
~ V1 + S ~ Zn = 2 ZL1 = 60 ZL3 = 20 ZL2 = 80
Figure P722 is corrected to 1 (or the power factor angle to zero) so that Is is minimized and in phase with Vo vs (t) = 450 cos( t) V Z = 7 0175 = 377 rad/s
~ V2 + S ~ Zg2 = 01
724 Without the capacitor connected into the circuit of
Figure P722, Vo = 450 0 V f = 60 Hz Is = 17 0175 A C = 1740 F
Figure P718
719 A large consumer of electricity requires 10 kW of
power at 230 Vrms at a pf angle of /3 rad lagging The transmission line between the electric utility and the consumer has a resistance of 01 If the consumer can increase the pf from 05 to 09 lagging, determine the change in transmission line losses and load current
720 A 1000-W electric motor is connected to a source
of 120 Vrms , 60 Hz, and the result is a lagging pf of 08 To correct the pf to 095 lagging, a capacitor is placed in parallel with the motor Calculate the current drawn from the source with and without the capacitor connected Determine the value of the capacitor required to make the correction
The value of C is that which will correct the power factor angle to zero, ie, reduces Is to a minimum value in phase with Vo Determine the reduction of current which resulted from connecting the capacitor into the circuit 725 Without the capacitor connected into the circuit: vo (t) = 170 cos t V is (t) = 130 cos( t 0192) A f = 60 Hz C = 387 F
721 If the voltage and current given below are supplied
by a source to a circuit or load, determine: a The power supplied by the source which is dissipated as heat or work in the circuit (load) b The power stored in reactive components in the circuit (load)
The value of C given is that which will correct the power factor angle to zero, ie, reduces Is to a minimum value in phase with Vo Determine by how much the current supplied to the plant is reduced by connecting the capacitor 726 Determine the time-averaged total power, the real power dissipated, and the reactive power stored in each
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