Question

На корпусе электрофена написано 220 В,1800 Вт. найти силу тока и сапротивление в рабочем режиме

Answer 1

P=J*U
J=P/U
J=1800Вт/220В=8 А
R=U/J
R=220В:8А=27,5 Ом

Answer 2

Calculation of Current and Resistance in the Working Mode

To find the current and resistance in the working mode of an electric heater with the specifications "220 V, 1800 W," we can use Ohm's Law. Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor.

The formula for Ohm's Law is:

V = I * R

Where: - V is the voltage (220 V in this case) - I is the current - R is the resistance

To find the current (I), we need to rearrange the formula:

I = V / R

Given that the voltage (V) is 220 V, we need to find the resistance (R) first.

To find the resistance, we can use the formula:

P = V^2 / R

Where: - P is the power (1800 W in this case) - V is the voltage (220 V) - R is the resistance

Rearranging the formula, we get:

R = V^2 / P

Substituting the given values, we have:

R = (220^2) / 1800

Now, we can calculate the resistance (R) using the above formula.

Calculating the resistance: R = (220^2) / 1800 = 27.1111 Ω (rounded to four decimal places)

Now that we have the resistance (R), we can calculate the current (I) using Ohm's Law:

I = V / R = 220 / 27.1111 ≈ 8.11 A (rounded to two decimal places)

Therefore, in the working mode, the current flowing through the electric heater is approximately 8.11 A and the resistance is approximately 27.1111 Ω.

Please note that the above calculations are based on the given specifications and assumptions.