Resistance of a Light Bulb Calculation

How can we calculate the hot resistance of a light bulb rated 35 W, 120 V?

Calculating the Hot Resistance

To calculate the hot resistance of a light bulb rated at 35 W, 120 V, we can use the power equation and Ohm's Law.

When it comes to finding the hot resistance of a light bulb with specific power and voltage ratings, we need to utilize both the power equation (P = IV or P = V^2/R) and Ohm's Law (V = IR).

Given that the light bulb is rated at 35W (power) and 120V (voltage), we need to start by using the power equation to find the resistance. Rearranging the power equation to solve for R, we get R = V^2 / P.

Now, plug in the values: R = (120V)^2 / 35W. After performing the calculation, you should find that the hot resistance of the 35 W, 120 V light bulb is approximately 411.4 ohms.

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