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# EET113-Ch4

### Ch 4 Glossary

Circuit breaker A two-terminal device designed to ensure that current levels do not exceed safe levels. If "tripped," it can be reset with a switch or a reset button.
Diode A semiconductor device whose behavior is much like that of a simple switch; that is, it will pass cuiTent ideally in only one direction when operating within specified limits.
Efficiency (η) A ratio of output to input power that provides immediate information about the energy-converting characteristics of a system.
Energy (W) A quantity whose change in state is determined by the product of the rate of conversion (P) and the period involved (t). It is measured in joules (J) or wattseconds (Ws).
Fuse A two-terminal device whose sole purpose is to ensure that current levels in a circuit do not exceed safe levels.
Horsepower (hp) Equivalent to 746 watts in the electrical system.
Kilowatthour meter An instrument for measuring kilowatt hours of energy supplied to a residential or commercial user of electricity.
Ohm's law An equation that establishes a relationship among the current, voltage, and resistance of an electrical system.
Power An indication of how much work can be done in a specified amount of time: a rate of doing work. It is measured in joules/second (J/s) or watts (W).
Created by: rbartholomy

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