A student investigates how the current through a filament light bulb varies with the potential difference across it.
(a) Draw a diagram of a circuit the student could use to obtain suitable measurements for a range of
potential difference from 0 V to 12 V.

The two required components for a generator

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.

What causes the development of most clouds and precipitation in the atmosphere?