Question

Электрический прибор при силе тока 5А за 45 мин потребляет 162Дж энергии расчитайте сопротивления прибора

Answer 1

А=I ²Rt
 R=A/I ² t
R=1080000Дж/5 ² А*1800 с= 24 Ом

Answer 2

Calculation of Resistance

To calculate the resistance of an electrical device, we can use Ohm's Law, which states that the resistance (R) is equal to the voltage (V) divided by the current (I). In this case, we are given the current (5A) and the energy consumed (162J), but we need to calculate the resistance.

The formula for calculating energy is given by:

Energy (E) = Power (P) x Time (t)

Since power is equal to voltage (V) multiplied by current (I), we can rewrite the formula as:

E = V x I x t

We are given the current (I = 5A) and the time (t = 45 min = 2700 s), and we need to calculate the voltage (V).

Let's rearrange the formula to solve for voltage:

V = E / (I x t)

Substituting the given values:

V = 162J / (5A x 2700s)

Calculating the voltage:

V ≈ 0.012 V

Now that we have the voltage, we can use Ohm's Law to calculate the resistance:

R = V / I

Substituting the values:

R = 0.012 V / 5A

Calculating the resistance:

R ≈ 0.0024 Ω

Therefore, the resistance of the electrical device is approximately 0.0024 Ω.