Electricity Calculation Discussion

What is the power of an 85-W lamp connected to 100 V?

The power of the lamp connected to 100 V is 85 Watts.

Electricity Calculation Discussion

When determining the power of an electrical device, the formula P=V^2/R is used, where P represents power, V is voltage, and R is resistance. In this case, we have an 85-W lamp connected to 100 V. By using the formula, we can calculate the resistance of the lamp and then determine its power.

Given that the voltage is 100 V and the power of the lamp is 85 W, we can use the formula R=V^2/P to find the resistance. Plugging in the values:

R = V^2 / P = 100 x 100 / 85 = 117.64 Ohms

Therefore, the resistance of the lamp is 117.64 Ohms. With this information, we can now calculate the power of the lamp connected to 100 V.

Using the power formula P=V^2/R and substituting the resistance value we calculated earlier:

P = V^2 / R = 100 x 100 / 117.64 ≈ 85 Watts

So, the power of the 85-W lamp connected to 100 V is 85 Watts. This shows that the lamp is operating at its specified power rating when connected to the given voltage.