T4E: Power calculations, units, kilo, mega, milli, micro
T4E01:
What unit is used to describe electrical power?
Watt
Ohm
Farad
Volt
T4E02:
What is the formula used to calculate electrical power in a DC circuit?
Power (P) equals voltage (E) multiplied by current (I)
Power (P) equals voltage (E) divided by current (I)
Power (P) equals voltage (E) minus current (I)
Power (P) equals voltage (E) plus current (I)
T4E03:
How much power is represented by a voltage of 13.8 volts and a current of 10 amperes?
138 watts
0.7 watts
23.8 watts
3.8 watts
T4E04:
How much power is being used in a circuit when the voltage is 120 volts and the current is 2.5 amperes?
300 watts
1440 watts
48 watts
30 watts
T4E05:
How can you determine how many watts are being drawn by your transceiver when you are transmitting?
Measure the DC voltage at the transceiver and multiply by the current drawn when you transmit
Measure the DC voltage and divide it by 60 Hz
Check the fuse in the power leads to see what size it is
Look in the Radio Amateur's Handbook
T4E06:
How many amperes are flowing in a circuit when the applied voltage is 120V and the load is 1200 watts?
10 amperes
20 amperes
120 amperes
5 amperes
T4E07:
How many milliamperes is the same as 1.5 amperes?
1500 milliamperes
15 milliamperes
150 milliamperes
15000 milliamperes
T4E08:
What is another way to specify the frequency of a radio signal that is oscillating at 1,500,000 Hertz?
1500 kHz
1500 MHz
15 GHz
150 kHz
T4E09:
How many volts are equal to one kilovolt?
one thousand volts
one one-thousandth of a volt
one hundred volts
one million volts
T4E10:
How many volts are equal to one microvolt?
one one-millionth of a volt
one million volts
one thousand kilovolts
one one-thousandth of a volt
T4E11:
How many watts does a hand-held transceiver put out if the output power is 500 milliwatts?
0.5 watts
0.02 watts
5 watts
50 watts
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