Electric Circuits Answers

. In the circuit shown in the figure, the ideal ammeter measures I = 0.4A in the indicated sense, and the ideal voltmeter measures a potential drop of V = 8.8V passing from b a a. Determines the value of the emf . Data: R = 56.212, R = 23.312, R = 27.4.2. & (A E = ? R: SR OR a

A piece of silver wire has a resistance of 1.0Ω. What will be the resistance of a manganin wire; 

one-third the length and one-third the diameter if the resistivity of manganin is 30 times that of silver.

1. Calculate the wavelength of a waveform given a period of 17μs.
2. Find the input thermal noise voltage of a receiver with a bandwidth of 3.33 kHz, with an input resistance of 42 Ω, and a temperature of 29^oC.
3. Given the signal power of 2.3 μW and the noise power of 0.7 μW, calculate the signal-to-noise ratio.
4. Three (3) AM broadcast stations are spaced at 18 kHz, beginning at 73 kHz. Each station is allowed to transmit modulating up to 6 kHz. Compute for the upper and lower sidebands of each station.
5. Given a dc bias of 0.5mA and a bandwidth of 10 kHz, calculate for the noise current.

1. Assuming that an oscilloscope displays a V_max of 5.22V and V_min of 1.33V. Calculate the percentage of modulation. (5 points)
2. Three (3) AM broadcast stations are spaced at 18 kHz, beginning at 73 kHz. Each station is allowed to transmit modulating up to 6 kHz. Compute for the upper and lower sidebands of each station and plot it in the frequency domain. (15 points)
3. Given a V_max of 7.45V and a modulation index of 0.691, calculate for V_min. (5 points)
4. A station is given a carrier frequency of 88 kHz. Having a modulating frequency of 12 kHz, compute for the upper and lower sidebands of the station. (5 point

Assume Young's modulus for bone is 1.5 x 10¹⁰N/m². The bone breaks if stress greater than 1.5 x 10⁸ N/m² is imposed on it. 1) What is the maximum force that can be exerted on the femur bone in the leg if it has a minimum effective diameter of 2.5 cm? 2) If this much force is applied compressively, by how much does the 25 cm long bone shorten?

One property Q of a material is used to describe the behaviour of sound waves in the material.Q is defined as the pressure P of the sound wave divided by the speed v of the wave and the surface area A of the material through which the wave travels:

Q=P/vA

Two resistors of 4Ω & 6Ω are connected in series and then to a 12v source. How much is the total

current drawn by the circuit?

  A stone is released from rest at a height of 122.5 m. a) What is its velocity after 2 seconds? b) How many seconds will it take for the stone to reach the ground, and c) With what velocity will it hit the ground?