Figure ( a ), a 41 ? resistor is connected to a battery. Figure ( b ) shows the

Question

Figure (a), a 41  ? resistor is connected to a battery. Figure (b) shows the increase of thermal energy Eth in the resistor as a function of time t. The vertical scale is set by Eth,s = 3.50 mJ, and the horizontal scale is set by ts = 9.4  s. What is the electric potential across the battery?

Figure (a), a 41 ? resistor is connected to a battery. Figure (b) shows the increase of thermal energy Eth in the resistor as a function of time t. The vertical scale is set by Eth,s = 3.50 mJ, and the horizontal scale is set by ts = 9.4 s. What is the electric potential across the battery?

Explanation / Answer

Slope of the graph gives us the power

P =(3.5*10^-3-0)/(9.4)

P=3.72*10^-4 Watts

since

Power

P=V^2/R

=>V=sqrt[P*R] =sqrt[3.72*10^-4*41]

V=0.1236 V

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