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6 February, 07:12

A computer monitor uses 2.0 a of current when it is plugged into a 120 v outlet. the monitor is never turned off. what is the yearly cost of operating the monitor if the cost of electricity is $0.12/kwh

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  1. 6 February, 07:33
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    Power (P) is calculated by multiplying current (I) and voltage (V). This can be mathematically expressed as,

    P = I x V

    P = (2.0 A) x (120 V)

    = 240 W

    Converting 1 year to number of hours,

    1 year x (365 days/1 year) x (24 hr / 1 day)

    = 8760 hours

    Calculating for the cost of power,

    Cost = (240 W) x (1 kW/1000 W) x ($0.12/kWh) x (8460 hours)

    Cost = $203.04

    Thus, the yearly cost of power is approximately $203.04.
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