An electric current is said to exist when there is a net flow of electric charge through a region. In electric circuits this charge is often carried by electrons moving through a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in an ionized gas (plasma).
Gravity affet everything and it touches nothing.
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Resistivity of nichrome is high.
the moon is illminated
tracing paper is not transparent
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A light year is = to 9.461 × 1015 metres
