Page 45 - How It Works - Book Of Amazing Answers To Curious Questions, Volume 05-15

Technology

How do electric

razors work?

The rotary
How these spinning blades cut hair, not skin electric razor
Take a closer look at how a
ody hair is tough; both men and women’s
rotary electric razor deals
hair is as hard as copper wire of equal with our varied hair growth
Bthickness, so any razor we use needs an
effective cutting mechanism. Electric razors use Easy access The body
either a foil or rotary system. Foil shavers contain This button releases The razor’s body is
the razor’s head, lightweight and easily
oscillating blades beneath a thin, steel, perforated allowing the user to manoeuvrable, housing the
foil. The foil functions to lift hair toward the blades, clean the razor and rechargeable battery and
helping the user obtain a very close shave. remove the collected motor system.
trimmings.
Rotary razors have circular blades that cut by
spinning. The blades can typically flex within the Long hair slits Short hair gaps

shaver, allowing easier access to curved areas than These slits target the These small circular
other razors. The rotary razor works best with a longer hairs, forcing holes target short hairs,
them toward the and vary slightly in size
circular motion, which encourages hair to slip into razor’s blades. to compensate for varied
the razor head gaps. hair length.
Which to go for depends as much on personal Three blades
preference as it does on functionality, but you are Typically a rotary Ergonomic flexing
far less likely to incur a life-threatening injury shaver has three blades The three blades are able to
in a triangular flex up and down within the

from either one compared to the cut-throat razors
structure, providing a razor, allowing effective
of old. large surface area. shaving of curved areas.

How are musical Discover how they can convert the
notes amplifi ed? stadium anthem
sound of strings into a thundering

Speaker
This part of the amp produces the
t is widely accepted that the introduction of The ‘combo’ amplifi er amplified sound. The wattage, and

the guitar amplifier changed music forever. therefore power, can vary depending

Inside a on preference.
IWhether you’re into Jimi Hendrix or Eric
combination
Clapton, it’s hard to imagine either without their guitar amp that
legendary riffs blasting out through guitar amps. contains both
A three-way process is used to amplify the the amplifi er
and speaker
strings’ sound. The strings vibrate at a particular
frequency; once plucked their signal passes
through the guitar’s pickups to the preamplifi er.
The preamplifier boosts the voltage of the signal

generated by the guitar. The preamp also reduces
the noise and interference within the guitar’s
sound, which could distort the resulting overall
sound when amplifi ed. Mounting
The power amp now amplifies the whole signal bracket Reverb box

and sends it to the speaker, which emits the connectors Many amps now
come with the
guitar’s sound at an adjustable volume. Amps for These two red reverberation
both the electric and acoustic guitars as well as wires connect the effect built in. This
mounting bracket serves to impart
bass guitars are commonplace today, shaping the © Riddell; ifixit
to the speaker via an echo on the
sound of all genres of modern music. two small nodes. guitar’s sound.
How It Works 45