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In a certain city, electricity costs $0.15 per kwh. what is the annual cost for electricity to power a lamp post for 6.5 hours per day with a 100 watt incandescent light bulb

Respuesta :

solution:

[tex]power consumption in 1 day=100\times 6.5\times365\\

=237250watt hour\\

1 watt hour=0.001kw hour\\

so,237250kw hour=237.25\\

1watt hour=\$ 0.15\\

so,237.250kw hour=237.25\times 0.15

=\$ 35.58[/tex]

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