Determine the resistance of the light bulb on the cylinder which is written: “100W; 200V”

univerkov | November 20, 2020 | education

Electrical resistance we can find the light bulbs by the formula R = U / I, where U is the voltage, and I is the current.
We have the voltage, we need to find the amperage. We calculate it from the formula P = IU. The current is I = P / U.
I = 100/200 = 0.5 A.
Then R = 200 / 0.5 = 400 ohms.
Answer: 400 ohms.

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