1W - 1J/s, use to measure atmospheric pressure - barometer, heat current - rate of heat flow, second and higher harmonics - overtones, a prism whose angle is very small - thin prism, lens formula - 1/u + 1/v = 1/f, electric field intensity - E = F/q, 1V - 1J/C, 1F - 1C/V, dielectric constant -  k, use to measure potential difference - voltmeter, 1kWh is taken as - one unit, cylindrical coil of wire - solenoid, use to measure an electric current - moving coil galvanometer, Ohm's law - V = IR, circuit equation - I = E / R+r, the moment of a couple - torque, pure semiconductors have - poor conductivity, diode is used as - a rectifier, J. J Thomson discovered - the electron,

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