Principles Of Electric Circuits
10th Edition
ISBN: 9780134879482
Author: Floyd, Thomas L.
Publisher: Pearson,
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Textbook Question
Chapter 4, Problem 3CDQ
A variable resistor has 5 V across it. If you reduce the resistance, the power in the resistor
- 1. increases
- 2. decreases
- 3. stays the same
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PSD
A certain signal f(t) has the following PSD (assume 12 load):
| Sƒ(w) = π[e¯\w\ + 8(w − 2) + +8(w + 2)]
(a) What is the mean power in the bandwidth w≤ 1 rad/sec?
(b) What is the mean power in the bandwidth 0.99 to 1.01 rad/sec?
(c) What is the mean power in the bandwidth 1.99 to 2.01 rad/sec?
(d) What is the total mean power in (t)?
Pav=
+
2T
SfLw) dw
- SALW)
An AM modulation waveform signal:-
p(t)=(8+4 cos 1000πt + 4 cos 2000πt) cos 10000nt
(a) Sketch the amplitude spectrum of p(t).
(b) Find total power, sideband power and power efficiency.
(c) Find the average power containing of each sideband.
Can you rewrite the solution because it is
unclear?
AM
(+) = 8(1+ 0.5 cos 1000kt +0.5 ros 2000ks)
=
cos 10000 πt.
8 cos wat + 4 cos wit + 4 cos Wat coswet.
-Jet
jooort
J11000 t
= 4 e
jqooort jgoort
+4e
+ e
+e
j 12000rt.
12000 kt
+
e
+e
jooxt
igoo t
te
(w) = 8ES(W- 100007) + 8IS (W-10000)
USB
Chapter 4 Solutions
Principles Of Electric Circuits
Ch. 4 - If 100 W of power occurs for 30 s, how much...Ch. 4 - Express the following amounts of power in watts...Ch. 4 - Prob. 3RPCh. 4 - How many kilowatt-hours are used by a 1/2 hp motor...Ch. 4 - Determine P in each circuit of Figure 4-2 for the...Ch. 4 - A 100 W light bulb operates on 120 V. How much...Ch. 4 - Prob. 7RPCh. 4 - A 0.25 W, 1.0 k resistor is connected across a 12...Ch. 4 - How will the total power delivered change if the...Ch. 4 - A power supply has an efficiency of 92%. If PIN is...
Ch. 4 - A certain battery delivers 10 A for 6 h. What is...Ch. 4 - The kilowatt-hour is a unit of power.Ch. 4 - One watt is equal to one joule per second.Ch. 4 - 0.050 W is the same as 50 mW.Ch. 4 - Prob. 4TFQCh. 4 - The kilowatt and the horsepower are both units of...Ch. 4 - The power rating of a resistor should always be...Ch. 4 - The amount of heat that a resistor can dissipate...Ch. 4 - If the voltage across a resistor doubles, the...Ch. 4 - Watts law states that power equals voltage times...Ch. 4 - If the current through a resistor doubles, the...Ch. 4 - Within limits, a regulated power supply can...Ch. 4 - The efficiency of a power supply can be expressed...Ch. 4 - A power supply that has a negative output voltage...Ch. 4 - A battery Ah rating is a guide to the amount of...Ch. 4 - When analyzing a circuit problem, you should...Ch. 4 - Power can be defined as 1. energy 2. heat 3. the...Ch. 4 - Two hundred joules of energy are consumed in 10 s....Ch. 4 - If it takes 300 ms to use 10,000 J of energy, the...Ch. 4 - In 50 kW, there are 1. 500 W 2. 5,000 W 3. 0.5 MW...Ch. 4 - In 0.045 W, there are 1. 45 kW 2. 45 mW 3. 4,500 W...Ch. 4 - For 10 V and 50 mA, the power is 1. 500 mW 2. 0.5W...Ch. 4 - When the current through a 10 k resistor is 10 mA,...Ch. 4 - A 2.2 k resistor dissipates 0.5 W. The current is...Ch. 4 - A 330 resistor dissipates 2 W. The voltage is 1....Ch. 4 - If you used 500 W of power for 24 h, you have used...Ch. 4 - How many watt-hours represent 75 W used for 10 h?...Ch. 4 - A 100 resistor must carry a maximum current of 35...Ch. 4 - The power rating of a resistor that is to handle...Ch. 4 - A 22 half-watt resistor and a 220 half-watt...Ch. 4 - When the needle of an analog ohmmeter indicates...Ch. 4 - A 12 V battery is connected to a 600 load. Under...Ch. 4 - A given power supply is capable of providing 8 A...Ch. 4 - A power supply produces a 0.5 W output with an...Ch. 4 - If the current through a fixed resistor goes from...Ch. 4 - If the voltage across a fixed resistor goes from...Ch. 4 - A variable resistor has 5 V across it. If you...Ch. 4 - If the voltage across a resistor increases from 5...Ch. 4 - If the resistance of a load connected to a battery...Ch. 4 - If the amount of time that a battery supplies...Ch. 4 - If the current that a battery supplies to a load...Ch. 4 - If there is no load connected to a battery, its...Ch. 4 - If the output voltage of a power supply increases,...Ch. 4 - For a constant power supply output voltage, if the...Ch. 4 - For a constant power supply output voltage, if the...Ch. 4 - If the load is removed leaving the power supply...Ch. 4 - Prove that the unit for power (the watt) is...Ch. 4 - Show that there are 3.6 106 joules in a...Ch. 4 - What is the power when energy is consumed at the...Ch. 4 - How many watts are used when 7,500 J of energy are...Ch. 4 - How many watts does 1,000 J in 50 ms equal?Ch. 4 - Convert the following to kilowatts: 1. 1,000 W 2....Ch. 4 - Convert the following to megawatts: 1. 1,000,000 w...Ch. 4 - Convert the following to milliwatts: 1. 1 W 2. 0.4...Ch. 4 - Convert the following to microwatts: 1. 2 W 2....Ch. 4 - Convert the following to watts: 1. 1.5 kW 2. 0.5...Ch. 4 - Prob. 11PCh. 4 - If a 300 W bulb is allowed to burn continuously...Ch. 4 - At the end of a 31-day period, your utility bill...Ch. 4 - Convert 5 106 watt-minutes to kWh.Ch. 4 - Convert 6,700 watt-seconds to kWh.Ch. 4 - For how many seconds must there be 5 A of current...Ch. 4 - If a 75 V source is supplying 2 A to a load, what...Ch. 4 - If a resistor has 5.5 V across it and 3 mA through...Ch. 4 - An electric heater works on 120 V and draws 3 A of...Ch. 4 - What is the power when there are 500 mA of current...Ch. 4 - Calculate the power dissipated by a 10 k resistor...Ch. 4 - If there are 60 V across a 680 resistor, what is...Ch. 4 - A 56 resistor is connected across the terminals...Ch. 4 - If a resistor is to carry 2 A of current and...Ch. 4 - A 12 V source is connected across a 10 resistor....Ch. 4 - The maximum voltage is 1 V and the maximum current...Ch. 4 - A 6.8 k resistor has burned out in a circuit. You...Ch. 4 - A certain type of power resistor comes in the...Ch. 4 - For each circuit in Figure 414, assign the proper...Ch. 4 - A 50 load uses 1 W of power. What is the output...Ch. 4 - Assume that an alkaline D-cell battery can...Ch. 4 - What is the total energy in joules that is...Ch. 4 - A battery can provide an average of 1.5 A of...Ch. 4 - How much average current can be drawn from an 80...Ch. 4 - If a battery is rated at 650 mAh, how much average...Ch. 4 - If the input power is 500 mW and the output power...Ch. 4 - To operate at 85% efficiency, how much output...Ch. 4 - Prob. 39P
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- Can you rewrite the solution because it is unclear? AM (+) = 8(1+0.5 cos 1000kt +0.5 ros 2000 thts) = cos 10000 πt. 8 cos wat + 4 cos wit + 4 cos Wat coswet. J4000 t j11000rt $14+) = 45 jqooort +4e + e + e j 12000rt. 12000 kt + e +e +e Le jsoort -; goon t te +e Dcw> = 885(W- 100007) + 8 IS (W-10000) - USBarrow_forwardCan you rewrite the solution because it is unclear? Q2 AM ①(+) = 8 (1+0.5 cos 1000πt +0.5 ros 2000kt) $4+) = 45 = *cos 10000 πt. 8 cos wat + 4 cosat + 4 cos Wat coswet. j1000016 +4e -j10000πt j11000Rt j gooort -j 9000 πt + e +e j sooort te +e J11000 t + e te j 12000rt. -J12000 kt + с = 8th S(W- 100007) + 8 IS (W-10000) <&(w) = USB -5-5 -4-5-4 b) Pc 2² = 64 PSB = 42 + 4 2 Pt Pc+ PSB = y = Pe c) Puss = PLSB = = 32 4² = 8 w 32+ 8 = × 100% = 140 (1)³×2×2 31 = 20% x 2 = 3w 302 USB 4.5 5 5.6 6 ms Ac = 4 mi = 0.5 mz Ac = 4 ५ M2 = =0.5arrow_forwardA. Draw the waveform for the following binary sequence using Bipolar RZ, Bipolar NRZ, and Manchester code. Data sequence= (00110100) B. In a binary PCM system, the output signal-to-quantization ratio is to be hold to a minimum of 50 dB. If the message is a single tone with fm-5 kHz. Determine: 1) The number of required levels, and the corresponding output signal-to-quantizing noise ratio. 2) Minimum required system bandwidth.arrow_forward
- Find Io using Mesh analysisarrow_forwardFM station of 100 MHz carrier frequency modulated by a 20 kHz sinusoid with an amplitude of 10 volt, so that the peak frequency deviation is 25 kHz determine: 1) The BW of the FM signal. 2) The approximated BW if the modulating signal amplitude is increased to 50 volt. 3) The approximated BW if the modulating signal frequency is increased by 70%. 4) The amplitude of the modulating signal if the BW is 65 kHz.arrow_forwardAn FDM is used to multiplex two groups of signals using AM-SSB, the first group contains 25 speech signals, each has maximum frequency of 4 kHz, the second group contains 15 music signals, each has maximum frequency of 10 kHz. A guard bandwidth of 500 Hz is used bety each two signals and before the first one. 1. Find the BWmultiplexing 2. Find the BWtransmission if the multiplexing signal is modulated using AM-DSB-LC.arrow_forward
- An FM signal with 75 kHz deviation, has an input signal-to-noise ratio of 18 dB, with a modulating frequency of 15 kHz. 1) Find SNRO at demodulator o/p. 2) Find SNRO at demodulator o/p if AM is used with m=0.3. 3) Compare the performance in case 1) and 2).. Hint: for single tone AM-DSB-LC, SNR₁ = (2m²) (4)arrow_forwardFind Va and Vb using Nodal analysisarrow_forwardCalculate the nodal voltage in the circuitarrow_forward
- Calculate the mesh currents, find Ia, Ib, Ic. Apply mesh analysisarrow_forwardFind Va and Vb using Nodal analysisarrow_forward4. A battery operated sensor transmits to a receiver that is plugged in to a power outlet. The device is continuously operated. The battery is a 3.6 V coin-cell battery with a 245mAHr capacity. The application requires a bit rate of 36 Mbps and an error rate of less than 10^-3. The channel has a center frequency of 2.4 GHz, a bandwidth of 10 MHz and a noise power spectral density of 10^-14 W/Hz. The maximum distance is 36 meters and the losses in the channel attenuates the signal by 0.25 dB/meter. Your company has two families of chips that you can use. An M-ary ASK and an M-ary QAM chip. The have very different power requirements as shown in the table below. The total current for the system is the current required to achieve the desired Eb/No PLUS the current identified below: Hokies PSK Chip Set Operating Current NOT Including the required Eb/No for the application Hokies QAM Chip Set Operating Current NOT Including the required Eb/No for the application Chip ID M-ary Voltage (volts)…arrow_forward
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