Englishfor English speakers
arc
Noun
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An arc is part of a circle.
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Electricity jumping from one place to another. This is very bright and looks like lightning.
arc
Verb
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If something arcs, it makes an electrical curve.
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If something arcs, it goes along a curved path.
lamp
Noun
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A lamp is something that makes light (either from electricity or by burning fuel).
It's getting dark so I'll switch on the lamp to read by.
Oil lamps have wicks that can smoke as they burn.
projector
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noun
an optical instrument that projects an enlarged image onto a screen
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noun
an optical device for projecting a beam of light