Answer:
P = 1.8 Watt
Explanation:
Electromotive Force (EMF)
It consists of a DC source ε with small internal resistance Ri. When it's connected to an external resistance Re a current i flows by the circuit whose value is given by:
[tex]\displaystyle i =\frac{\varepsilon }{R_i+R_e}[/tex]
The internal resistance of the battery is Ri=1 ohm and its emf is ε=12 V. When connected to an external resistance of Re=79 ohm, the current is:
[tex]\displaystyle i =\frac{12}{1+79}=\frac{12}{80}[/tex]
i = 0.15 A
The power delivered by the battery is:
P = ε.i
P = 12 V * 0.15 A
P = 1.8 Watt
