EET K144 Chapter Notes - Chapter Chp 2: Electric Current, Photodetector, Resistor

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Chapter 2 notes: fundamentals of electricity, magnetism, & circuits, conventional current ow - current in a conductor ows from positive to negative terminal. The actual electron ows in opposite direction: source delivers electrical power, a device is a source whenever current ows out of the positive terminal, ex. Photocell: load absorbs electrical power, a device is a load whenever current ows into a positive terminal, ex. Resistor: a battery is a sources when delivering power and a load when is recharging. A. e = emcos(2 * f t + : e = instantaneous voltage [v, em = peak value of the sinusoidal voltage [v] 2 f t are in radians, most people convert them to degrees (1) e = em cos(360f t + ) Thursday, august 30, 2018: for a voltage that varies sinusoidally, the relationship between " 2: most ac current instruments are calibrated to show the e ective value of voltage or current and not the peak value.

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