Answer:
P=1.12 W
Explanation:
We can use Ohm's law and the equation P=IV to determine the power generated from the circuit, which will eventually equate the power.
Ohm's law states that the current flowing through a conductor is directly proportional to the voltage across it and inversely proportional to the resistance. Mathematically, Ohm's law is represented as V=IR.
Given:
R=7.0 Ω
I= 400.0 mA => 0.4 A
(1) - Use Ohm's law to find the voltage
V=IR
=> V=(7.0 Ω)(0.4 A)
=> V=2.8 V
(2) - Now using the voltage we just found, we can use the power equation
P=IV
=> P=(0.4 A)(2.8 V)
=> P=1.12 W
Thus, the problem is solved.
