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A voltage of 60cos(4πt) V appears across the terminals of a 3mF capacitor. Calculate the current through the capacitor and the energy stored in it from t=0 to t=0.125 seconds.
A doorbell is connected to a transformer whose primary contains 3000 turns and which is connected to 120 VAC. If the doorbell requirs 0.2 A at 10 V, find the number of turns necessary for the secondary winding and the current that flows in the pri..
The expression for the steady-state voltage and current at the terminals of a given circuit are, V(t)=170cos(120pt + 50°)volts i(t)=40sin(120pt+68°)amps 1-What is the phase difference between the voltage and current
A 5-volt intelligence amplitude causes the frequency to change to ± 25 kHz. What will be the carrier frequency variation corresponding to an intelligence amplitude of 10 volts
An FM transmitter delivers to a 75 ohm antenna a signal voltage of \(V(t)=1000 sin(10^9t+4sin10^4t)\) Determine: (a)Carrier frequency (b) Intelligence frequency (c) Modulation index
A panasonic model Rx-ft560 stero uses a 12V_dc powwer supply. At full volume ( max triple min-bass) A max current of 1.4 amps is needed from the power supply. at min volume, this drops to 200mA. (hint: calculate the range of R_L)
Assuming that the feed point impedance of the complementary 0.475 l dipole is 70 + j0 ohms if it were fed in the center, calculate the distance Zf to use to obtain Zs = 50W for a signal frequency f = 1000 MHz.
Rain affects the downlink from the satellite and the overall CNR ratio in the receiver falls by 6.0 dB to 13.0 dB. What is the bit error rate and the time between errors now?
An Emitter follower with a BJT biased at Ic = 1mA and having β = 100 is connected between a source with Rsig = 20kg and a load RL = 1kg. a) find Rin, vb/vsig, and v0/vsig. b) If the signal amplitude across the base-emitter junction is to be limitd t..
What is the bandwidth required so that the modulated signal contains atheist 90% of the power of the unmodulated carrier. A carrier signal c(t) = 10 cos(2pifct) is modulated using a message signal m(t) cos(20pit). The modulation is FM, with kf = 50.
Determine the transconductance in the saturation region for the n-channel MOSFET using the following paramters at room temperature.1. p type Si density = 2.8*10^15 /cm^3 2. Si intrinsic carrier concentration = 8.6*10^9 /cm^3 3. Metal-semiconductor ..
What is the minimum sampling rate that can be used to obtain samples that completely specify the following signalx(t) = 10cos(20*pi*t) - 5cos(100*pi*t) + 20cos(400*pi*t)
A three-phase load is Y-connected. The load has a phase voltage of 139 V and a phase current of 49 A. Each phase of the load consumes 5.1 kW of power. (A) Sketch and label the load. Find (b) the line voltage, (c) the line current, and
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