Figure 27-49 shows a section of a circuit. The resistances are R1 = 2.0 Ω, R2 = 4.0 Ω, and R3 = 6.0

Figure 27-49 shows a section of a circuit. The resistances are
R1 = 2.0 Ω, R2 = 4.0 Ω, and R3 = 6.0 Ω,
and the indicated current is i = 6.0 A.
The electric potential difference
between points A and B that connect
the section to the rest of the circuit
is VA – VB = 78 V. (a) Is the device
represented by “Box” absorbing or
providing energy to the circuit, and
(b) at what rate?