Induction Cooking
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Big Cook, Little Cook
''Big Cook, Little Cook'' is a television series for preschool children broadcast on BBC television channels (particularly the CBeebies digital television channel). The programme is set in the kitchen of a café, with two principal characters, Big Cook Ben and Little Cook Small. Ben is a full-sized adult, but Small is only a few inches tall (along the lines of Tom Thumb) and rides around on his magical spoon.
The format of a programme generally includes a visit to the café by a nursery rhyme character (such as Little Miss Muffett or Humpty Dumpty). Little Cook tells a story about the visitor, and then they decide to cook the visitor an appropriate meal from Big's Cook's recipe book. One vital ingredient is usually missing from the kitchen cupboards, which gives Little Cook a chance to fly out of the kitchen on his spoon to retrieve the missing ingredient (and also visit a farm or a factory where it is made or packaged). Activities within the kitchen, such as washing up and tidying up, are invariably accompanied by the same song and dance routines.
Both chefs act is a ludicrously expansive and overblown style, but the show seems intended to encourage children to take an interest in cooking. Catchphrases include, when reminding the audience to get an 'adult helper' to assist with using the oven that it is "Hot, hot hot".
The actors, Dan Wright and Stephen Marsh, perform in a stand-up comedy double act, Electric Forecast.
http://www.bbc.co.uk/cbeebies/characterpages/bigcooklittlecook/ Big Cook, Little Cook from the BBC website
Category:BBC children's television programmes
Inductance
Inductance is a physical characteristic of an inductor, which is an electrical device that produces at any time a voltage proportional to the instantaneous rate of change in current flowing through it. The symbol ''L'' is used for inductance in honour of the physicist Heinrich Lenz. The SI unit of inductance is the henry (H). The term ''inductance'' was coined by Oliver Heaviside in February 1886.
In a typical inductor, whose geometry and physical properties are fixed, the voltage generated is as follows:
:
where
:''v'' is the voltage generated, measured in volts.
:''L'' is the ''inductance'' of the device, measured in henries.
:''di/dt'' is the rate of change of current, measured in amperes/second.
Strictly speaking, the quantity just defined is called ''self-inductance'', because the voltage is induced in the same conductor that carries the current. If the voltage is induced in another nearby conductor, the property is called ''mutual inductance'', which has the symbol ''M''. The above equation, with either ''L'' or ''M'' as the constant, applies to both cases.
The operation of an inductor can be understood using a simple loop of wire as an example. The current flowing through the loop of wire produces a magnetic field by Ampere's law. A change in current (''di/dt'') results in a change in this magnetic field. This changing magnetic field causes an electromotive force, that some refer to as a counter-electromotive force because it runs against the current that induces it, in the conductor under Faraday's law of induction, which results in a voltage (''v'') forming in such a direction as to oppose the change in current (see Lenz's law). The constant of proportionality ''L'', which tells us for a particular device how big a voltage should be expected for a given change in current, is called the inductance.
The self-inductance ''L'' of a solenoid (an idealization of a coil) can be calculated from
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Induction Cooking
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