Electric Circuits Answers

if the voltage is connected to a 5v battery. The ammeter in the circuit reads 2a. What is the value of the resistance?

A 3x10^-6 C Negative charge produces a force of 2X10^-2 N at a distance of o.ooo4 m with another unknown charge. What is the magnitude of the unknown charge?

Define a uniform electric field (E), and derive its work done in a moving charge (q) through a

distance (d)?

Consider two ohmic resistors denoted R1 and R2 which are connected in series with a

cell. Find the resistance and power of R2, given that the current flowing

through R1 and R2 is 0.25 A and that the voltage across the cell is 6 V. R1 = 1Ω.

A twenty-five volt battery, an ammeter, and a 5 ohm resistor are connected in series. Assume the resistor obeys Ohm’s law. There could be other circuit elements in the circuit. If the ammeter reads 1.9 A, are there other elements in the circuit? If so, what are they? Explain your reasoning using Kirchoff’s Laws and draw the circuit in the space below.

1. Calculate the wavelength of a waveform given a period of 17μs.

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

Solve for the equivalent resistance at terminal A&B using Wye-Delta/Delta-Wye Transformation, when 1 k ohm resistors are connected in the shape of a hexagonal prism.

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.