An electric lamp with a resistance of 240 ohms, designed for a voltage of 120 V, must be powered from a network
| March 3, 2021 | education
An electric lamp with a resistance of 240 ohms, designed for a voltage of 120 V, must be powered from a network with a voltage of 220 V. What resistance must be included in the circuit in order for the lamp to work in its nominal mode?
By law for a section of the chain:
I = U1 / R1 = U2 / R2 = (U1 – U2) / R2.
120/240 = (220 – 120) / R2.
R2 = 100: 1/2 = 100 * 2 = 200 ohms.
Answer: you need to turn on the resistance R2 = 200 Ohm.
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