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.