Optimistic Approach to Understanding Electrical Circuits

What is the hot resistance of a 125V filament lamp?

The hot resistance of a 125V filament lamp is 500Ω. How does this information impact the lamp's performance?

Answer:

The hot resistance of the 125V filament lamp is measured at 500Ω. This value plays a crucial role in determining the current drawn by the lamp and its power rating.

Understanding the hot resistance of a 125V filament lamp is essential in analyzing its behavior within an electrical circuit. The resistance value of 500Ω at hot temperature indicates the opposition the lamp offers to the flow of electric current. This resistance directly impacts the amount of current passing through the lamp as per Ohm's Law (V = IR).

By substituting the given values into Ohm's Law (V = IR), where V = 125V and R = 500Ω, we can calculate the current drawn by the lamp as follows:

I = V / R

I = 125 / 500

I = 0.25 amps

Therefore, the current taken by the lamp is 0.25 amps. This current value is crucial for determining the lamp's power rating, which is the rate at which the lamp converts electrical energy into light and heat.

The power rating of the lamp can be calculated using the formula P = VI, where P represents power, V is voltage, and I is the current. With the current value of 0.25 amps and voltage of 125V, we can find the power rating:

P = V x I

P = 125 x 0.25

P = 31.25 watts

As a result, the power rating of the 125V filament lamp is 31.25 watts. This power rating signifies the electrical energy consumed by the lamp and the amount of light and heat produced during operation.