Electric Circuits Answers

define Flux density ?

A moving coil instrument have a resistance of 25ohms gives full scale deflection when a current of 20mA is passed through it..Calculate the values of resistance required to enable the instrument to be used as (I) 0-10A ammeter (ii) 0-100v voltmeter

If q₁=-8.2C and q₂=4.9C, what is the electric potential difference V_a-V_b (in gigavolts GV)?

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.

Three resistors of 6-ohm resistance are connected in delta. Inside the delta, another 6-ohm resistor  is connected in wye. Find the resistance between any two corners. 

1. Given a dc bias of 0.5mA and a bandwidth of 10 kHz, calculate for the noise current.

. 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.