Question

1. Сила струму в паяльнику 3,6 А при напрузі 220 В. Визначте потужність струму в паяльнику. 36 Вт 120 ВТ 792 ВТ 1256 ВТ 2.Розрахуйте витрату елекроенергії холодильника, який ввімкнули в мережу з напругою 220 В на 15 хв, якщо його сила струму 15 А 30 000 Дж 126 254 Дж 123 456 Дж 1 234 567 Дж 2 970 000 Дж 3.Електричний нагрівник, який вмикають у мережу, напругою 220 В, нагріває воду за 4 хв 36 с. Алюмінієву спіраль замінили латунь такого самого розміру. Скільки часу тепер знадобиться для нагрівання чаю? Втратами енергії знехтувати 1234 с 125 с 869 с 3654 с

Answer 1

Ответ:

1. 792 BT

2. 2970000 Дж

3. 1234 с (не уверен)

Объяснение:

Answer 2

1. The power of an electrical device can be calculated using the formula: Power (P) = Current (I) x Voltage (V). In this case, the current in the soldering iron is 3.6 A and the voltage is 220 V. Therefore, the power of the soldering iron can be calculated as follows:

P = 3.6 A x 220 V = 792 W [[1]].

So, the power of the soldering iron is 792 Watts.

2. The energy consumption of an electrical device can be calculated using the formula: Energy (E) = Power (P) x Time (t). In this case, the power of the refrigerator is 15 A and the voltage is 220 V. The time it is turned on is 15 minutes (or 15/60 = 0.25 hours). Therefore, the energy consumption of the refrigerator can be calculated as follows:

E = 15 A x 220 V x 0.25 hours = 825 Joules [[2]].

So, the energy consumption of the refrigerator is 825 Joules.

3. The time it takes to heat the tea can be calculated using the formula: Time (t) = Energy (E) / Power (P). In this case, the power of the electric heater is not provided, so we cannot calculate the exact time it takes to heat the tea. However, if we assume that the power of the aluminum spiral is the same as the power of the brass spiral, we can use the given time of 4 minutes and 36 seconds (or 4 minutes + 36 seconds/60 = 4.6 minutes) to calculate the power. Therefore, the power of the electric heater can be calculated as follows:

P = E / t = 30,000 J / 4.6 minutes = 6,522.73 Watts [[3]].

So, the power of the electric heater is approximately 6,522.73 Watts. However, it is important to note that this calculation assumes that the power of the aluminum and brass spirals is the same, which may not be accurate in reality.

As for the time it now takes to heat the tea with the brass spiral, it is not provided in the question, so we cannot calculate it.

Please let me know if there is anything else I can help you with!