In what order do energy transformations in an Inductive Furnace occur? a) Thermal, electrical, magnetic. b) Electrical, thermal, magnetic. c) Magnetic, thermal, electrical. d) Electrical, magnetic, thermal.
To figure out in what order the energy transformations in this furnace occur, we can
draw a diagram of an inductive furnace. A furnace of this type consists of a nonconducting chamber which contains chunks of
metal. This container is wrapped about by a coil of wire, which carries an alternating
current through its loops.
Since this coil of wire is effectively a solenoid as alternating current runs through
it, time-varying magnetic fields are set up that pass through the chamber as well as
the chunks of metal inside. This changing magnetic field induces in the chunks of metal inside the chamber small
loops of current called eddy currents.
These loops of current flow in opposition to the natural resistivity of these chunks
of material. In the same way that a light bulb heats up as current passes through it, so do these
chunks of metal as the eddy currents work in them. The currents are powerful enough to generate enough heat that the chunks of metal
reach their melting point. And this is how these pieces are melted down and mixed together in the nonconducting
We see then that this process begins with an electrical current leading to the
generation of a magnetic field which creates thermal heating in the material in the
nonconductive chamber. That order of energy transformations matches up with choice d) electrical, magnetic,