Question

Какое количество теплоты выделяется проводником за 2 мин при напряжении 220В и силе тока 300мА

Answer 1

Количество теплоты
Q=IUt
I=300мА=0,3 A
t=2мин=120c
Q=0,3×220×120=7920Дж=7,92кДж
Ответ 7,92кДж

Answer 2

Calculation of Heat Generated by a Conductor

To calculate the amount of heat generated by a conductor, we can use the formula:

Q = I^2 * R * t

Where: - Q is the heat generated (in joules) - I is the current flowing through the conductor (in amperes) - R is the resistance of the conductor (in ohms) - t is the time for which the current flows (in seconds)

In this case, we are given the following values: - Voltage (V) = 220V - Current (I) = 300mA = 0.3A - Time (t) = 2 minutes = 120 seconds

To calculate the resistance (R), we can use Ohm's Law:

R = V / I

Substituting the given values, we have:

R = 220V / 0.3A

Let's calculate the resistance first:

R = 220 / 0.3 = 733.33 ohms

Now, we can calculate the heat generated (Q):

Q = (0.3A)^2 * 733.33 ohms * 120 seconds

Q = 0.09 * 733.33 * 120 = 8039.99 joules

Therefore, the amount of heat generated by the conductor in 2 minutes is approximately 8039.99 joules.

Please note that the above calculation assumes that the resistance remains constant throughout the 2-minute period. If the resistance changes, the calculation may vary.