State the energy changes takes place when they are used. [2]
(i) Electromagnet (ii) thermocouple
e. Define Kilo watt hour. How it is related to joule?
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(I) An electromagnet: Electrical energy into magnetic energy..
(ii) A Thermocouple: Heat into electrical energy.
(e)The kilowatt-hour is a composite unit of energy equal to one kilowatt (kW) of power sustained for one hour. Expressed in the standard unit of energy in the International System of Units (SI), the joule (symbol J), it is equal to 3600 kilojoules or 3.6*10⁶J ..
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