2. Consider the switching oscillator shown below built from a threshold-controlled inverting Schmitt Trigger and a resistor-capacitor path. Assume that the output levels of the comparator are 0 (zero) and A. (1) for what threshold values of Vc does the Schmitt Trigger change state (or switch output)? (2) compute the frequency of oscillation for the periodic output waveform in terms of R and C. R + Vc Vo Rf 2Rf Rf +A

3.a. There may be installations where grounded conductors of different systems are installed within the sameraceway, cable, or box. In these cases, it's imperative that the system-grounded conductors remainA. spliced.B. disconnected.C. separated.D. buried.3.b. In dwelling units, the maximum allowable voltage between conductors that supply lighting fixtures isA. 220 V.B. 120 V.C. 115 V.D. 110 V.

16.  The total voltage in a series-parallel circuit is __________     equal to the sum of the voltage drops across each resistor in the circuit.     distributed across each branch in the circuit.     determined by the product-over-sum method.     equal to the voltage drop of the parallel branch. Which of the following statement is true both for a series and a parallel DC circuit?     powers are additive     voltages are additive     currents are additive     elements have individual currents Electric power is the ________     same as electric pressure.     total number of electrons flowing in a circuit.     number of electrons passing a given point in one second.     rate of using or producing electric energy. A battery produces a current of 0.6 A when the external resistance is 2 ? and 0.2 A when the external resistance is 12 ?. Find the emf of the battery     3 V     6 V     9 V     12 V