What is the Resistance of Light Bulbs A and B?
What is resistance?
Resistance Definition
Resistance can be defined as the ability of a conducting material to oppose the flow of electric current.
To determine the light bulb with the greatest filament resistance, we can use the following formula:
Formula:
- P = V²/R (Equation 1)
Making R the subject of the equation:
- R = V²/P (Equation 2)
Where:
- P = power of the bulb
- V = Outlet voltage
- R = Resistance of the filament
For Light Bulb A:
- P = 60 W
- V = 120 V
Substitute these values into equation 1:
- R = (120²)/60
- R = 240 ohms
For Light Bulb B:
- P = 100 W
- V = 120 V
Substitute these values into equation 1:
- R = (120²)/100
- R = 144 ohms
Hence, from the calculations, it is evident that Light Bulb A has the greater filament resistance.