Amateur radio study guide has much information about electronics

Ham radio is nothing new, however if your new to electronics, or interested in becoming a ham, we suggest reading one of Dan’s self-study guides. [via]

The RMS value of an AC signal is the voltage that causes the same power dissipation as
a DC voltage of the same value. (G5B07) For an AC signal with a sine-wave shape, the
RMS value is .707 times the peak value. 12 volts is the RMS voltage of a sine wave with
a value of 17 volts peak. (G5B09)

Conversely, the peak-to-peak value of an AC signal is 2 × 1.414 × the RMS value.
Accordingly, 339.4 volts is the peak-to-peak voltage of a sine wave that has an RMS
voltage of 120 volts. (G5B08)

Power is equal to the RMS voltage times the current, or
P (watts) = VRMS x I

Using Ohm’s Law, we can show that:
P = V2RMS / R
P = I2 x R

Amateur radio study guide has much information about electronics – [Link]

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