lock in ‘meter’ capable of being charged to 2.4 x 106 Volt potential before sparking into the air, given that dielectric strength of air is 24,000 V/cm.   (ii) Find the heat energy(flow) in ‘Joules’ required to prepare a coffee in an electric kettle with 0.5 litre (1litre = 10-3 m3 ) of water which is heated from 30ºC to 85ºC?

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