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23-02-2021
Physics

contestada

At what rate is thermal energy being generated in the 2R-resistor when  = 12 V and R = 3.0 ?

a. 12 W
b. 24 W
c. 6.0 W
d. 3.0 W
e. 1.5 W

Respuesta :

23-02-2021

If there's nothing else connected to the battery except the 3-ohm resistor, then the question is defective and the correct answer is not on the list.

With 12v connected across the resistor, the current through the resistor is

I = (E/R) = (12/3) = 4 Amperes.

The power generated inside a resistor is

P = (E x I) = (12v) x (4 A) = 48 watts

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