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An unknown load is connected to a standard European household outlet (240 V rms, 50 Hz). Determine the phase angle difference between the voltage and current, and whether the voltage leads or lags the current, if (a) V = 240/243 V rms and I = 3/9 A rms; (b) the power factor of the load is 0.55 lagging; (c) the power factor of the load is 0.685 leading; (d) the capacitive load draws 100 Waverage power and 500 volt-amperes apparent power.
Why developing software for wireless devices is challenging? List and briefly describe the two (2) reasons given in your textbook for why developing software for wireless devices is challenging.
The random variable X is a continuous type distribution F(x). Use the function y=F(x) to transform random variable X into a new random variable Y=F(x). Find the density function that describes random variable Y.
An electric kettle needs six minutes to boil 2 kg of water from the initial temperature of 20"C. The cost of electrical energy required for operation is 12 paise, the rate being 40 paise per kWh.
During a walk at the park we spot blue birds and red birds. Suppose each red bird with probability 3/4 and blue birds with probability 1/4. (a) In a collection of 5 randomly selected birds, what is the probability that none are blue
An inventor claims to have perfected an engine that wil produce power from energy transferred as heat from a 1000K flame. Energy wil be rejected as heat to the ground at 290 K. A 75 percent energy conversion efficiency is claimed.
Determine the initial stored charge. Determine energy of the capacitor. If this capacitor is discharged to 0 V in a time interval of 1 s, find the average power delivered by the capacitor during the discharge interval.
Design I/O wiring to control forward and reverse 12Vdc motor using PLC OMRON CJ1M. Consider that the forward movement of the motor will be controlled by a forward button and the reverse movement of the motor will be controlled by a reverse button
The complex power of an electrical load is S = 1 + j VA. If the voltage across the loadis 10V RMS with a radian frequency f=1 rad/s, find the value of a single component to connect in parallel with the load so that the new load has a unity power f..
Determine the maximum raw instantaneous data rate that can be provided to a single user in EDGE, assuming that a single time slot on a single GSM channel is available.
We would like to monitor the first two least significant bits of PORTB (use masking technique). Whenever both of these bits are set, switch all LEDs of Port A on for one second. Assume that the name of the delay subroutine is DELAY.
How does a transistor switch compare to a mechanical switch. In other words, a mechanical switch when it is ON has zero impedance. What about the transistor switch.
Derive the state space quation of a DC motor with supply voltage and load torque as inputs and armature current, angular speed as outputs.
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