An electric heater with a capacity of 2500w connected with a constant voltage source of 220V. Calculate (a) Resistance of heating wires (b) How much is the cost of using this heater for thirty days at a rate of ten hours a day, noting that the price of electricity is forty fils per kilowatt hour (kw.h)
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bro use formula
p
=
w÷t
v=ir
r=pl÷a
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