* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download (Kelvin) emits radiation in vacuum at a rate in W
Spark-gap transmitter wikipedia , lookup
Analog television wikipedia , lookup
Oscilloscope history wikipedia , lookup
Superheterodyne receiver wikipedia , lookup
Integrating ADC wikipedia , lookup
Radio transmitter design wikipedia , lookup
Operational amplifier wikipedia , lookup
Immunity-aware programming wikipedia , lookup
Analog-to-digital converter wikipedia , lookup
Josephson voltage standard wikipedia , lookup
Current source wikipedia , lookup
Valve RF amplifier wikipedia , lookup
Current mirror wikipedia , lookup
Schmitt trigger wikipedia , lookup
Power electronics wikipedia , lookup
Power MOSFET wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Surge protector wikipedia , lookup
Voltage regulator wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
UNIVERSITY OF MASSACHUSETTS DARTMOUTH COLLEGE OF ENGINEERING EGR 101 INTRODUCTION TO ENGINEERING I This assignment is due Thursday, October 29, 2009. Use engineering papers. Show all of your steps. Present your work neatly and clearly. Box your final answers. Problem 1 Problem 4 in Chapter 9 on p. 281. Calculate the period in ms. Calculate frequency in kHz. Express the signal as VS t Vpk sin t if this is a voltage source. On the scope the voltage scale is 5 V/div. Problem 2 Consider a signal whose angular frequency is 500 x 103 rad/sec. Calculate the frequency in kHz. Calculate the period in s . Problem 3 Consider an alternating voltage source VS with an amplitude of 50 V and a period of 10 s . Express the source voltage as VS t Vpk sin t by identifying V pk and . Determine V1, pk and V2, pk across resistors R1 and R2 by the voltage divider method. Problem 4 Consider the triangular voltage signal (V) as a function of time in ms. Identify the points in time where the function is discontinuous. What is the period of the signal? What is the voltage as t approaches 0.2 ms from the left? What is the voltage as t approaches 0.2 ms from the right? Plot the derivative of this function in the interval 0 t 0.8 ms . What is the derivative at t = 0.2 ms? Problem 5 In class, you learned that an alternating voltage can be generated by turning a wire blob between two magnets. Please visit the following link for an animation: http://www.physclips.unsw.edu.au/jw/electricmotors.html#alternator You may see the wire already turning when you open the page. However, you can push the play button to repeat the animation. Use your watch or a timer, click the play button and time in seconds how long it takes the wire to execute two rotations. Repeat your experiment 10 times. Calculate the mean value based on your 10 data points. rad Calculate the wire angular speed in and rpm based on your average time. s Calculate the frequency of the voltage in Hz and the period in s.