Question

В квартире имеется две электролампы по 60 Вт и две по 40 Вт. Каждую из них включают на 3 часа в сутки. Определите стоимость энергии, израсходованный лампами за один месяц ( 30 дней) Действующий тариф за 1 кВт - 2 рубля, 60 копеек

Answer 1

(40+40+60)×3=600 вт в сутки
600×30÷1000=18 квт в месяц
18×2,6=46,8 рублей

Answer 2

Calculation of Energy Consumption

To calculate the cost of energy consumed by the lamps in one month, we need to determine the total energy consumed by each lamp and then calculate the total cost based on the given tariff.

Given: - Two lamps with a power rating of 60 W each. - Two lamps with a power rating of 40 W each. - Each lamp is turned on for 3 hours per day. - The tariff for 1 kWh is 2 rubles and 60 kopecks.

To calculate the energy consumed by each lamp per day, we can use the formula:

Energy consumed (in kWh) = Power (in kW) x Time (in hours)

For the 60 W lamps: - Power = 60 W = 0.06 kW - Time = 3 hours

Using the formula, we can calculate the energy consumed by each 60 W lamp per day:

Energy consumed by each 60 W lamp per day = 0.06 kW x 3 hours = 0.18 kWh

For the 40 W lamps: - Power = 40 W = 0.04 kW - Time = 3 hours

Using the formula, we can calculate the energy consumed by each 40 W lamp per day:

Energy consumed by each 40 W lamp per day = 0.04 kW x 3 hours = 0.12 kWh

Now, let's calculate the total energy consumed by all the lamps per day:

- Total energy consumed by the 60 W lamps per day = 0.18 kWh x 2 lamps = 0.36 kWh - Total energy consumed by the 40 W lamps per day = 0.12 kWh x 2 lamps = 0.24 kWh

To calculate the total energy consumed by all the lamps in one month (30 days), we multiply the daily energy consumption by the number of days:

- Total energy consumed by all the lamps in one month = (0.36 kWh + 0.24 kWh) x 30 days = 18 kWh

Finally, let's calculate the cost of the energy consumed based on the given tariff:

- Cost of energy consumed = Total energy consumed x Tariff per kWh - Cost of energy consumed = 18 kWh x (2 rubles + 60 kopecks/100) = 18 kWh x 2.60 rubles/kWh = 46.8 rubles

Therefore, the cost of energy consumed by the lamps in one month is 46.8 rubles.