Question

When an incandescent electric bulb glows

(a) the electric energy is completely converted into light

(b) the electric energy is partly converted into light energy and partly into heat energy

(c) the light energy is converted into electric energy

(d) the electric energy is converted into magnetic energy

Answer 1

(b) the electric energy is partly converted into light energy and partly into heat energy

A bulb uses heat caused by an electrical current. When electrical current passes through a wire, it causes the wire to heat. The wire, or filament, gets so hot that it glows and gives off light energy.