Consider the block diagram of system shown below. A zone sensor act as an input to the switching circuit. It determines the on and off condition of circuit in green block. The yellow block is an audio alarm. It turns on after receiving a suitable input from switching circuit. Transistor switching circuits Audible alarm Zone I sensors Consider the following switching circuit for green block above Vcc +10V Rc L0kN O VOUT a. Consider the base current (IB) to be equal to 50 uA. Calculate the output values of sensor that will turn the alarm ON? b. Calculate the maximum value of RB when VIN is equal to the sum of last two digits of our registration number. Note: if your registration Number is 20-cs-122 than VIN = 2+2 =4

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Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.