Question

СРОЧНО 20 БАЛЛОВ!!!!С РЕШЕНИЕМ ПОЖАЛУЙСТА ! Как изменится мощность постоянного тока,если при неизменном сопротивлении увеличить напряжение на участке цепи в 3 раза?

Answer 1

Мощность  постоянного тока увеличиться в 9 раз , так как существует формула   P=U^2/R и если U увеличиться в 3 раза , то P=9.

Answer 2

Effect of Increasing Voltage on Power in a DC Circuit

When the voltage in a DC circuit is increased while the resistance remains constant, the power in the circuit will also increase. This relationship can be explained using Ohm's Law and the formula for power in a DC circuit.

Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage across it and inversely proportional to the resistance. Mathematically, Ohm's Law can be expressed as:

V = I * R

where: - V is the voltage across the circuit, - I is the current flowing through the circuit, and - R is the resistance of the circuit.

The formula for power in a DC circuit is:

P = V * I

where: - P is the power in the circuit, - V is the voltage across the circuit, and - I is the current flowing through the circuit.

By substituting Ohm's Law into the power formula, we can derive an expression for power in terms of voltage and resistance:

P = (V * V) / R

From this equation, we can see that power is directly proportional to the square of the voltage and inversely proportional to the resistance.

Now, let's consider the scenario described in the question: increasing the voltage on a circuit segment by a factor of 3 while keeping the resistance constant. In this case, the new voltage (V') can be expressed as:

V' = 3V

Substituting this value into the power formula, we can calculate the new power (P'):

P' = (V' * V') / R = (3V * 3V) / R = 9(V * V) / R = 9P

Therefore, when the voltage is increased by a factor of 3 while the resistance remains constant, the power in the circuit will increase by a factor of 9.

Please note that the above explanation is based on the assumption that the resistance remains constant. If the resistance were to change, the relationship between voltage, current, and power would be different.