Question

Скільки виділиться теплоти в реостаті за 20 хв, якщо його опір 80 Ом і спад напруги на нього 0,6 В

Answer 1

Q=I²Rt
I=U/R
I=0,6В/80Ом=0,075А
Q=(0,075А)²*80Ом*1200с=5,4Дж

Answer 2

Calculation of Heat Generated in a Resistor

To calculate the heat generated in a resistor, we can use the formula:

Q = I^2 * R * t

Where: - Q = heat generated (in joules) - I = current (in amperes) - R = resistance (in ohms) - t = time (in seconds)

Given: - Resistance (R) = 80 ohms - Voltage drop (V) = 0.6 volts - Time (t) = 20 minutes = 1200 seconds (since 1 minute = 60 seconds)

First, we need to find the current (I) flowing through the resistor using Ohm's law:

V = I * R

Solving for I: I = V / R

Substitute the given values: I = 0.6 V / 80 Ω I = 0.0075 A

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

Q = I^2 * R * t

Substitute the values: Q = (0.0075 A)^2 * 80 Ω * 1200 s Q ≈ 7.2 joules

So, the heat generated in the resistor over 20 minutes is approximately 7.2 joules.