How to Calculate Current and Power Rating of a Filament Lamp?
What is the current taken by a filament lamp with a hot resistance of 625 Ohms and a voltage of 250 volts?
A. 0.4 Amperes
B. 0.6 Amperes
C. 0.8 Amperes
D. 1.0 Amperes
What is the power rating of the filament lamp with the given resistance and voltage?
A. 75 Watts
B. 100 Watts
C. 125 Watts
D. 150 Watts
When the hot resistance of a 250 volt filament lamp is 625, the current taken by the lamp is calculated using Ohm's law (I = V/R) to be 0.4 Amperes, and its power rating is calculated using the formula P = V*I, resulting in 100 Watts.
The question asked how to calculate the current taken by a filament lamp with a hot resistance of 625 Ohms and a voltage of 250 volts, as well as its power rating. This problem involves applying Ohm's Law and the power formula to find the desired values.
To determine the current (I), we utilize Ohm's Law which states I = V/R, where V is the voltage of 250 volts and R is the resistance of 625 Ohms. Substituting the given values, we get I = 250/625 = 0.4 Amperes.
Next, to calculate the power rating (P), we use the formula P = V*I. By substituting the known values, we obtain P = 250*0.4 = 100 Watts.
Therefore, when the hot resistance of a 250 volt filament lamp is 625, the current taken by the lamp is 0.4 Amperes, and its power rating is 100 Watts.
It is essential to understand the relationship between voltage, current, resistance, and power in electrical circuits to solve such problems effectively.