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An electric heater is made of a wire of resistance 100Ω and connected to a 240V supply. Determine the:
(i) Power rating of the heater.
(ii) Current flowing in the circuit.
(iii) Time taken for the heater to raise the temperature of 200g of water from `23^0C` to `95^0C` (specific heat capacity of water is
`4200J Kg^-1K^-1`).
(iv) Cost of using the heater for two hours a day for 30 days. (the power and lighting company charges Kshs 5.00 per kilowatt–hour).