
8 Analog Electronics
form, or more simply a sine wave. It is the
waveform generated across the ends of a loop of
wire rotating in a uniform magnetic field, such as
the earth's field may be considered to be, at least
over a localized area. Its frequency is measured in
cycles per second or hertz (Hz), which is the
modern term. As a necessary result of Ohm's law,
not only is the current waveform in a resistive
circuit the same shape as the voltage waveform,
but also its peaks and troughs line up with the
voltage waveform as shown in Figure 1.5. The sine
wave shown contains alternating energy at one
frequency only, and is the only waveshape wit ...