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Gen - 65B - Decibels, PEP, RMS,...
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Terms in this set (14)
A two-times increase/decrease in power results in a change of how many d B?
~3 d B
How does the total current relate to the individual currents in each branch of a parallel circuit?
It equals the sum of the currents through each branch.
How many watts of electrical power are used if 400 V D C is supplied to an 800 ohm load?
200 watts. ( E=IR & I=E/R )
How many watts of electrical power are used by a 12-V D C light that draws 0.2 amps?
2.4 watts
How many watts are dissipated when a current of 7 milliamps flows through 1.25 kilohms?
~61 milliwatts ( E=IR & P=IE )
What's the output P E P from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50 Ω dummy load connected to the transmitter output?
100 watts. PEP = (PEV x .707)2 / R, PEV = PEP/2 )
Which value of an ac signal results in the same power dissipation as a d c voltage of the same value?
The R M S value
What's the peak-to-peak voltage of a sine wave that has an R M S voltage of 120 volts?
339.4 volts (Peak voltage = RMS x √2, Peak-to-peak multiply by 2 )
What's the R M S voltage of a sine wave with a value of 17 volts peak?
12 volts ( RMS = Peak voltage x .707 )
What % of power loss would result from a transmission line loss of 1 d B?
20.50%
What's the ratio of P E P to average power for an unmodulated carrier?
1.00
What would be the R M S voltage across a 50 ohm dummy load dissipating 1,200 watts?
245 volts ( P = E2/R => E = √P/R )
What's the output P E P of an unmodulated carrier if an ave reading wattmeter connected to the transmitter output indicates 1060 watts?
1060 watts
What's the output P E P from a transmitter if an oscilloscope measures 500 volts peak to peak across a 50 ohm resistor connected to the transmitter output?
625 watts [ PEP = (ERMS)2 / R ) ]
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