Question

СРОЧНО Какое количество теплоты выделяется за 2 мин в спирали автомобильной лампы накаливания сопротивлением 8 Ом, если на неё подано напряжение 12 В? Ответ дать в Дж.!!!!

Answer 1

Ответ:

Объяснение:

Дано:

t = 2 мин = 120 с

R = 8 Ом

U = 12 В

__________

Q - ?

По закону Ома:

I = U / R = 12 / 8 = 1,5 Ом

По закону Джоуля-Ленца количество теплоты:

Q = I²·R·t = 1,5²·8·120 = 2 160 Дж

Answer 2

Calculation of Heat Generated by an Automotive Incandescent Lamp

To calculate the amount of heat generated by an automotive incandescent lamp in a given time period, we need to use the formula:

Q = I^2 * R * t

Where: - Q is the heat generated (in Joules) - I is the current flowing through the lamp (in Amperes) - R is the resistance of the lamp (in Ohms) - t is the time period (in seconds)

In this case, we are given the following values: - Resistance (R) = 8 Ohms - Voltage (V) = 12 Volts - Time (t) = 2 minutes = 120 seconds

To find the current (I), we can use Ohm's Law:

V = I * R

Rearranging the formula, we get:

I = V / R

Substituting the given values, we have:

I = 12 V / 8 Ohms = 1.5 Amperes

Now, we can calculate the heat generated (Q) using the formula mentioned earlier:

Q = I^2 * R * t

Substituting the values we have:

Q = (1.5 A)^2 * 8 Ohms * 120 s

Calculating this expression, we find:

Q = 27 * 8 * 120 J = 25,920 J

Therefore, the amount of heat generated by the automotive incandescent lamp in 2 minutes is 25,920 Joules.

Please note that the above calculation assumes that all the electrical energy is converted into heat energy. In reality, some energy may be lost as other forms of energy, such as light and sound.