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# ELE 340 Spring 1998 HW 1 1 A circuit containing a ground fault circuit interrupter (GFCI) and a circuit breaker is shown in the figure. The GFCI is a...

I need to sovle 3, 4 and 5, but if you can only do one I would like 5.
thanks
ELE 340 Spring 1998 HW 1 1 A circuit containing a ground fault circuit interrupter (GFCI) and a circuit breaker is shown in the figure. The GFCI is a device that opens the circuit if the difference between the current in the two conductors flowing through the device is greater than 0.5 mA. a)If the circuit breaker is rated at 15 A describe how the circuit elements ( the circuit breaker and the GFCI) would behave under the following situations. i) The load resistance is 10 . ii) The load resistance is 5 . iii) The load resistance is 10 and a person grabs the hot line at point "A" creating a 500 k path to ground. iv) The load resistance is 10 and a person grabs the hot line at point "A" creating a 100 k path to ground. b) Describe the importance of each component in circuit safety. 120 v 2 For the circuit shown in the figure V 1 V 2 V 3 V 4 V S I 1 I 2 I S + - + - + - + - + - R L L C V S = 120 ∠0 ° ϖ = 200 rad/sec L = 0.05 H C = 4mF R = 10
a) Find all currents and voltages b) Draw and label the phasor diagram corresponding to a). 3 A single phase motor draws a current of 20A at 0.85 lagging power factor when operating from a 220v, 60 Hz source. Find a) The total real and reactive power drawn by the motor b) The value of the capacitance in parallel with the motor that will raise the power factor from the source to 0.9 lagging . 4 For the balanced three phase circuit shown in the figure j2 3 6 500 μ F 9.0mH b c Generator 3-phase, 440v, 60 Hz All loads are balanced a) Draw the per-phase equivalent circuit b) Find the currents at each load and the source c) Find the total real and reactive power absorbed or delivered by each load or source.
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