Question

P=300вт R1=20ом R2=30ом I-?

Answer 1

Решение на фото. Успехов тебе!

Answer 2

To find the current (I) flowing through the circuit, you can use Ohm's Law, which states:

$I = \frac{V}{R}$

Where: I = Current (in Amperes, A) V = Voltage (in Volts, V) R = Resistance (in Ohms, Ω)

In your case, you have the power (P) and two resistances (R1 and R2), and you need to find the total current (I) flowing through the circuit.

First, we need to find the total resistance (R_total) of the circuit. In this case, since R1 and R2 are in parallel, you can calculate the total resistance using the formula:

$\frac{1}{R_{\text{total}}} = \frac{1}{R_1} + \frac{1}{R_2}$

$R_{\text{total}} = \frac{R_1 \cdot R_2}{R_1 + R_2}$

Now, plug in the values:

$R_{\text{total}} = \frac{20\Omega \cdot 30\Omega}{20\Omega + 30\Omega}$

$R_{\text{total}} = \frac{600\Omega}{50\Omega}$

$R_{\text{total}} = 12\Omega$

Now, we can find the current (I) using the formula:

$I = \frac{P}{V}$

But we still need to find the voltage (V) across the total resistance. We can use Ohm's Law again to find the voltage:

$V = I \cdot R_{\text{total}}$

Since we have the power (P) given as 300 Watts, we can rearrange the power formula to find the voltage (V):

$V = \sqrt{P \cdot R_{\text{total}}}$

$V = \sqrt{300\text{W} \cdot 12\Omega}$

$V = \sqrt{3600\text{W}\Omega}$

$V = 60\text{V}$

Now, we can calculate the current (I):

$I = \frac{V}{R_{\text{total}}}$

$I = \frac{60\text{V}}{12\Omega}$

$I = 5\text{A}$

So, the current flowing through the circuit is 5 Amperes (A).