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Title: Electrical Engineering Question? Post by: dartz1221 on Aug 9, 2012 For a given linear circuit, the output voltage is 5V when an input voltage of 20V is applied to the circuit. What is the output voltage if 16V is applied to the circuit?
A. 20V B. 4V C. Must use Kirchhoff's laws to determine. D. 8V Title: Electrical Engineering Question? Post by: oaghasey on Aug 9, 2012 There is not enough information given to give a specific output voltage, so the correct answer is C.
. Title: Electrical Engineering Question? Post by: dastefster on Aug 9, 2012 b. 4v
Title: Electrical Engineering Question? Post by: o2blea on Aug 9, 2012 The key here is that it's a linear circuit, meaning Vo=Vi*k (k is a constant).
k = Vo1/Vi1 = 5/20 = 1/4 k = Vo2/Vi2 = 1/4 Vi2 = 16V Therefore, Vo2 = 16*(1/4) = 4V Answer is B Title: Electrical Engineering Question? Post by: oaghasey on Aug 9, 2012 Let us construct a counter example. Consider a circuit consisting of a resistor connected from the input to ground and a 5 V battery connected from the output to ground and no other components. Obviously, the output is 5 V for all inputs. Therefore the answer is C.
Title: Electrical Engineering Question? Post by: das1130 on Aug 9, 2012 B since it is telling you the ckt is linear. basically it has a gain of 1/4. so Vout/Vin = 1/4 5/20 = 1/4 1 VOUT = GAIN * INPUT = 1/4*16 = 4
Title: Electrical Engineering Question? Post by: lgood4 on Aug 10, 2012 Just going by your information:
20/5 = 16/x x = 8 volts This is the answer unless there is something else in this linear circuit. Title: Electrical Engineering Question? Post by: julie7 on Aug 10, 2012 OMG, are you asking others to do your homework for you!!
Title: Electrical Engineering Question? Post by: julibyrd on Aug 10, 2012 B. 4 Volt
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