. An air conditioner uses 1,800 W of power when plugged into a wall socket that operates at a voltage of 210 V. What is the current flowing through the air conditioner? If the air conditioner above were run for 180 hours per month, how much energy is used? If it costs $0.12/kWh, how much will it cost to run the air conditioner?

Explanation:

Given that:

Power, P = 1800W

Voltage, V = 210 V

Current, I flowing through the air conditioner;

Recall :

P = IV

1800 = I * 210

I = 1800 / 210

I = 8.5714

Current flowing through the air conditioner = 8.57 ampere

If air-conditioner runs for 180 hours per month,

Energy used = Power * time

Energy used = 1800 * 180

Energy used = 324000Wh

1Kw = 1000 W

324000 / 1000 = 324 Kwh

If charge = $0.12 per kwh

Monthly cost = $0.12 * 324

Monthly cost = $38.88