Question

При напряжении 220В на зажимах резистора сила тока=0.1 А.Какое напряжение подано на резистор ,если сила тока стала = 0.05А?

Answer 1

По закону Ома i=u\R=> R=u\i, R=2200 Ом, если сила тока изменилась то новое напряжение = 2200*0.05 = 110 В.

Answer 2

Calculating Voltage Change in a Resistor

When the voltage across a resistor changes, the current flowing through it can be calculated using Ohm's law, which states that the current (I) flowing through a resistor is directly proportional to the voltage (V) across the resistor and inversely proportional to the resistance (R) of the resistor. The formula for Ohm's law is:

V = I * R

Where: - V = Voltage across the resistor - I = Current flowing through the resistor - R = Resistance of the resistor

Initial Situation:

Given: - Voltage (V1) = 220V - Current (I1) = 0.1A

Using the formula V = I * R, we can calculate the resistance (R) of the resistor using the initial current and voltage.

R = V1 / I1

R = 220V / 0.1A R = 2200Ω

New Situation:

Now, if the current (I2) becomes 0.05A, we can calculate the voltage (V2) using the same resistance (R).

V2 = I2 * R

V2 = 0.05A * 2200Ω V2 = 110V

Therefore, if the current flowing through the resistor becomes 0.05A, the voltage across the resistor would be 110V. This is calculated using the relationship between voltage, current, and resistance as per Ohm's law.