Question

По 2-м посдедовательно соединённым электрическим лампочкам, включенным в сеть напряжением 220В, проходит ток 0,5 А. Определите напряжение на каждой ламрочке, если сопротивление первой лампочки в 3 раза больше, чем во второй

Answer 1

R=U/I=220/0,5=440 В
R1+3*R1=R
4*R1=R
R1=R/4=440/4=110 B
U1=I*R1=0,5*110=55 B
U2=I*(R-R1)=0,5*(440-110)=165 B

Answer 2

По закону ома : I=U/R ; т.к. последовательное соединение, то R=R1+R2 ; по условию R1=3*R2 ,следовательно R= 3R2+R2=4*R2 ; из закона ома следует, что R=I/U ; в нашем случае - 4*R2=220B/0.5A=440 Oм. R2=440/4=110 Oм; R1= 110*3=330 Ом. Ответ: R1=330 Oм R2= 110 Oм, U1= I*R1 ; U1=330*0,5=165 B ; U2= 110* 0.5= 55B

Answer 3

To determine the voltage across each lamp in a series circuit with two connected light bulbs, we need to consider the current and the resistance of each bulb. In this case, the current passing through the circuit is 0.5 A, and the resistance of the first bulb is three times greater than the resistance of the second bulb.

Calculating the Resistance:

Let's assume the resistance of the second bulb is R. Since the resistance of the first bulb is three times greater, the resistance of the first bulb would be 3R.

Applying Ohm's Law:

According to Ohm's Law, the voltage across a resistor is equal to the current passing through it multiplied by its resistance. Therefore, we can calculate the voltage across each bulb using the following formula:

Voltage = Current × Resistance

Voltage across the Second Bulb:

For the second bulb, the resistance is R and the current passing through it is 0.5 A. Plugging these values into the formula, we get:

Voltage across the second bulb = 0.5 A × R

Voltage across the First Bulb:

For the first bulb, the resistance is 3R and the current passing through it is 0.5 A. Plugging these values into the formula, we get:

Voltage across the first bulb = 0.5 A × 3R

Simplifying the Equations:

To simplify the equations, we can factor out the common term of 0.5 A:

Voltage across the second bulb = 0.5 A × R = 0.5R V

Voltage across the first bulb = 0.5 A × 3R = 1.5R V

Final Answer:

Therefore, the voltage across the second bulb is 0.5R V, and the voltage across the first bulb is 1.5R V.

Please note that the actual voltage values will depend on the specific resistance values of the bulbs, which are not provided in the question.