Question

Дві електричні лампи з’єднали паралельно й приєднали до джерела струму, напруга на якому становить 120 В. Визначте силу струму в кожній лампі й у нерозгалуженій частині кола, якщо опір однієї лампи дорівнює 200 Ом, а другої — 300 Ом.

Answer 1

Ответ:

I₁=0,6 A, I₂=0,4 A, I=1 A

Объяснение:

I₁=U/R₁=120/200=0,6 A ток первой лампочки

I₂=U/R₂=120/300=0,4 A ток второй лампочки

I=I₁+I₂=0,6+0,4=1 A ток не разветвленной части

Answer 2

Calculation of Current in Each Lamp and the Unbranched Circuit

To determine the current in each lamp and the unbranched circuit, we can use Ohm's Law, which states that the current flowing through a conductor is equal to the voltage across the conductor divided by its resistance.

Given: - Voltage across the circuit (V) = 120 V - Resistance of Lamp 1 (R1) = 200 Ω - Resistance of Lamp 2 (R2) = 300 Ω

To find the current in each lamp, we can use the formula:

Current (I) = Voltage (V) / Resistance (R)

Let's calculate the current in each lamp:

For Lamp 1: Current in Lamp 1 (I1) = Voltage (V) / Resistance of Lamp 1 (R1)

For Lamp 2: Current in Lamp 2 (I2) = Voltage (V) / Resistance of Lamp 2 (R2)

Now, let's substitute the given values into the formulas to calculate the currents:

For Lamp 1: Current in Lamp 1 (I1) = 120 V / 200 Ω

For Lamp 2: Current in Lamp 2 (I2) = 120 V / 300 Ω

Simplifying the calculations:

For Lamp 1: Current in Lamp 1 (I1) = 0.6 A

For Lamp 2: Current in Lamp 2 (I2) = 0.4 A

To find the current in the unbranched circuit, we can add the currents in each lamp:

Total Current in the Unbranched Circuit = Current in Lamp 1 + Current in Lamp 2

Substituting the calculated values:

Total Current in the Unbranched Circuit = 0.6 A + 0.4 A

Simplifying the calculation:

Total Current in the Unbranched Circuit = 1 A

Therefore, the current in each lamp is 0.6 A and 0.4 A, respectively, and the current in the unbranched circuit is 1 A.