In a certain city, electricity costs $0.16 per kw⋅h. what is the annual cost for electricity to power a lamppost for 7.00 h per day with a 100. w incandescent light bulb versus an energy efficient 25 w fluorescent bulb that produces the same amount of light? assume 1 year=365 days.

The annual cost for electricity to power a lampost for 7.00 h per day with a 100 W incandescent bulb is $ 40.89.The annual cost for electricity to power the same lampost for the same time with an energy efficient 25 W fluorescent bulb is $ 10.22.

So, you can save $ 40.89 - $ 10.22 = $ 30.67 per each lampost if you replace the incadescent bulb with the energy efficient fluorescent bulb.

Explanation:

kW.h means kilowatt.hour and is a unit of energy derived from the definition of power.

The definition of power is energy per time:

Power = Energy / time

Thus, you get:

Energy  = Power × time.

For the units, you get:

[Energy] = [Power] [time] = KW.h.

1. Calculate the energy used by the 100 W incandescent light bulb that is used 7.00 h per day, in a year (365 days).

E = Power × time = 100 W × 7.00 h / day × 365 day / year ×  24 h= 255,500 W.h/yearDivide by 1,000 to convert to kW: 255.5 kW.h/year

2. Calculate the energy used by the 25 W flourescent bulb:

E = 25 W × 7.00 h / day × 365 day / year ×  24 h= 63,875 W.h/yearDivide by 1,000 to convert to kW: 63.875 kW.h/year

3. Now, you can calculate both costs:

Cost per year = cost per kW.h times number of kW.h per year

    100 W bulb:

$ 0.16/ kW.h × 255.55 kW.h/ year = $ 40.89 / year

     25 W bulb:

$ 0.16/ kW.h × 63.875 kW.h/ year = $ 10.22 / year

Answerit curves up and levels out.explanationwe assume that the container contains absolutely no ammonia to begin with as it states that "nitrogen gas and hydrogen gas" react to "produce ammonia."at dynamic equilibrium, the product and reactant concentrations are equal.this means that, starting from a concentration of zero, [nh₃] must curve "up" from zero and then level out to a constant concentration.

The phase where ice changes directly to gas is called sublimation