An electric soldering iron with a resistance of 1.2 kOhm is included in an electrical circuit with a voltage of 220 V
| January 10, 2021 | education
An electric soldering iron with a resistance of 1.2 kOhm is included in an electrical circuit with a voltage of 220 V. Find the power consumed by the soldering iron.
From the Joule-Lenz law:
P = (U ^ 2) / R,
where P is the power consumed by the conductor, U is the voltage on the conductor, R is the resistance of the conductor.
P = 220 * 220/1200 = 40.3 W
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