An electric generator includes a channel for directing a flow of a first fluid and a thermoacoustic resonance chamber that penetrates the channel, including a first heat exchanger inside the channel and a second heat exchanger outside the channel, wherein the thermoacoustic resonance chamber has a toroidal shape configured to enclose a second fluid adapted to create a resonance of and carry an acoustic pressure wave to transfer heat between the first heat exchanger and the second heat exchanger. The thermoacoustic resonance chamber includes a plurality of channels to provide a plurality of resonance cavities capable of supporting standing thermoacoustic waves around the toroidal shape. The plurality of channels are configured to partition the thermoacoustic resonance chamber into a plurality of tubular channels extending around the toroidal shape.