When the voltage across the resistor is 110 V, the current flowing through it is 0.1A.
| January 31, 2021 | education
When the voltage across the resistor is 110 V, the current flowing through it is 0.1A. What voltage should be shown across the resistor so that the current in it becomes equal to 0.2A?
Initial data: Un (initial voltage across the resistor) = 110 V; In (initial current strength) = 0.1 A; Ik (required current in the rheostat) = 0.2 A.
The voltage that must be applied to the resistor is determined from the equality: Un / In = R (constant resistance of the rheostat) = Uk / Ik, whence Uk = Un * Ik / In.
Calculation: Uk = 110 * 0.2 / 0.1 = 220 V.
Answer: The rheostat must be supplied with a voltage of 220 V.
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