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Overview. A thermostat exerts control by switching heating or cooling devices on or off, or by regulating the flow of a heat transfer fluid as needed, to maintain the correct temperature. A thermostat can often be the main control unit for a heating or cooling system, in applications ranging from ambient air control to automotive coolant control.

If you're caught in a loop where the sign-in screen keeps reappearing after you click "Sign in," you'll need to reset the "sign-in" cookie. 1. After entering your username on the sign-in page, click Not you? 2. Enter your username and password. 3. Click Sign in. If that doesn't fix the problem, try these steps and attempt to sign in after each ...

Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact customer care by email, chat, or phone number.

The original intention was that this code might be used as part of some form of digital cash or micropayment scheme, as proposed, for example, by GNU Taler, but that has not yet happened, and this code is not widely used. Google Developers API uses this status if a particular developer has exceeded the daily limit on requests.

Reed switch. (from top) Single-pole reed switch, four-pole reed switch and single-pole reed relay. Scale in centimeters. Reed switch, contact detail. The reed switch [i] is an electromechanical switch operated by an applied magnetic field. It was invented in 1922 by professor Valentin Kovalenkov at the Petrograd Electrotechnical University, [1 ...

A basic transformer consisting of two coils of copper wire wrapped around a magnetic core. A transformer is a passive component that transfers electrical energy from one electrical circuit to another circuit, or multiple circuits. A varying current in any coil of the transformer produces a varying magnetic flux in the transformer's core, which ...