Assuming the cost of energy from the electric company is $0.120/kWh, compute the

Question

Assuming the cost of energy from the electric company is $0.120/kWh, compute the cost per day of operating a lamp that draws a current of 1.30 A from a 110-V line.

Part 1 of 4 - Conceptualize

We estimate the cost for operating such a lamp to be less than a dollar per day.

Part 2 of 4 - Categorize

We buy energy from the electric company. We need to find the energy use for one day from the power, current, and potential difference.

Part 3 of 4 - Analyze

The power of the lamp is given by

Part 4 of 4 - Analyze

For the energy used in a 24-hour day, we have

Therefore, for one day,

P = I(V)

=   A   V

= W =  kW.

Explanation / Answer

Power of the bulb P= V*I= 110*1.3=143W=0.143kW

Energy used per day by the lamp= P*t=0.143*24=3.432kWh

Cost = E*rate

3.432*0.120=$0.41184 per day

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