Van de Graaff generator – an electrostatic generator which separates charges to produce a large potential difference(see figure 17.6)
Varifocal lens– a lens which must be refocused whenever you change its focal length
Vector - a quantity that is specified by both a magnitude and a direction
Vector sum – the resultant vector when two or more vectors are added
Velocity– a quantity that describes both the direction and speed of motion
Virtual image – an image formed at a point where the light appears to have come from
Viscosity – that property of a fluid that indicates its internal friction
Volt– the unit of electric potential; a joule per coulomb
Voltmeter – an instrument for measuring potential difference or voltage
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