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A 19 Ω resistor is connected to a battery. The figure below shows the increase of thermal energy E_th,s = 2.5 mJ with t_s=4.0 s. What is the electric potential (V) across the battery? Hint: Calculate power using the graph and then use P=V²/R. Note the units in the graph.

R
(a)
Eth,s
ts
t (s)
Eth (mJ)

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