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2. 2N3055 - Wikipedia

   en.wikipedia.org/wiki/2N3055

   The 1967 RCA Transistor Manual, SC-13, did not mention any measure of high frequency performance for the 2N3055; by the 1971 SC-15 manual a transition frequency, f T, of at least 800 kHz was specified (at I C = 1 A) and f hfe (the frequency at which the small-signal current gain drops by 3 dB) was also specified at 1 A to be 10 kHz minimum.

3. AC power plugs and sockets - Wikipedia

   en.wikipedia.org/wiki/AC_power_plugs_and_sockets

   The NEMA 5-15 plug has two flat parallel blades like NEMA 1-15, and a ground (earth) pin. [47] It is rated 15 A at 125 volts. The ground pin is longer than the line and neutral blades, such that an inserted plug connects to ground before power. The ground hole is officially D-shaped, although some round holes exist.

4. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   Two light switches in one box. The switch on the right is a dimmer switch. The switch box is covered by a decorative plate. The first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne. [1]

5. AC adapter - Wikipedia

   en.wikipedia.org/wiki/AC_adapter

   Some "universal" replacement power supplies allow output voltage and polarity to be switched to match a range of equipment. [7] With the advent of switch-mode supplies, adapters which can work with any voltage from 110 VAC to 240 VAC became widely available; previously either 100–120 VAC or 200–240 VAC versions were used.

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