Question

My bathroom mirror is lit by eight 75 watt bulbs. Each bulb consumes 75 watt- hours (Wh) per hour that it is on. The lights are on for approximately 2 hours each day. How many kilowatt-hours (kWh) of energy are consumed by the bathroom lights in 1 year?

Answer 1

Answer:

The amount of power in kilowatt hour consumed by the the bathroom lights in 1 year is 438,000 kWh

Explanation:

The given parameters are;

The number of bulbs in the bathroom = 8

The power rating of each bulb = 75 W

The number of hours each bulb is lit on daily = 2 hours

The number of days in a year for which the kWh is sought = 365 days

The kilowatt hour consumed by the the bathroom bulb in 1 year = 8 × 75 ×2 × 365 = 438,000 kWh

The kilowatt hour consumed by the the bathroom bulb in 1 year = 438,000 kWh.

Answer 2

Answer:

The amount of power in kilowatt hour consumed by the the bathroom lights in 1 year is 438 kWh

Explanation:

The given parameters are;

The number of bulbs in the bathroom = 8

The power rating of each bulb = 75 W

The number of hours each bulb is lit on daily = 2 hours

The number of days in a year for which the kWh is sought = 365 days

The watt hour consumed by the the bathroom bulb in 1 year = 8 × 75 ×2 × 365 = 438,000 wh

The watt hour consumed by the the bathroom bulb in 1 year = 438,000 wh.

Now you have to convert to kWh which is 438,000/1,000

The kWh used per year by the bathroom bulbs is 438 kWh.

(I just used the other person's work, but they forgot to convert wh to kWh)