# Chapter 12

 Direct current (DC) Current that travels in one direction Alternating current (AC) electrons move back and forth Transformer An electrical device that changes the size of potential difference of alternating current Circuit breaker A safety device that is placed in series with other circuits, which lead to appliances and outlets Fuse A safety device that is found in older buildings and some appliances; like a circuit breaker, it is placed in series with other circuits, which lead to appliances and outlets Electrical power The rate at which an appliance uses electrical energy measured in watts (W) or kilowatts (kW)-1 kW = 1000 W Watt (W) A unit of measurement that measures potential difference or electrical energy Kilowatt (kW) 1 kW = 1000 W Electrical energy The energy that is used by an appliance at a given setting measured in kilowatt-hours (kW.h) Kilowatt-hour (kW∙h) (kw)      (h)E=P     x   Δt   Power  Time EnerGuide label A label that gives details about how much energy an appliance uses in one year of normal use Smart meter A meter that records the total electrical energy used hour by hour and sends this information to the utility company automatically Time of use pricing A system of pricing in which the cost of each kW.h of energy used is differnt at differnt times of the day.- It is broken down into off-peak, mid-peak, and on-peak times for pricing Phantom load The electricity that is consumed by an appliance or device when it is turned off - TV's, clock displays, external power adaptors require phantom load- Easiest way to prevent a phantom load is to unplug an appliance Efficiency The ratio of useful energy output to total energy input expressed as a percentage -Energy input is its power (kW) multiplied by the time (s) it is turned on Base load The continues minimum demand for electrical power The minimum amount of electrical power needed in Ontario is about 12 000 MW1 MW = 1 megawatt = 106 W Hydroelectric power generation It is used to generate power for peak loads, and base loads. Intermediate load A demand for electricity that is greater than the base load. It is met by burning coal and natural gas. Peak load The greatest demand for electricity, which is met by using hydroelectric power, and natural; gas. Renewable energy source A source of energy that can be replaced in a relatively short period of time Non-renewable energy source A source of energy that cannot be replaced as quickly as it is used Solar energy -free fuel-little negative impact on the environment-not very concentrated-expensive Photovoltaic effect The photovoltaic effect is the creation of voltage or electric current in a material upon exposure to light. Biomass energy less acid rainno-heavy metalsreduction of CO2 and sulfur emissionsnot a large supply of biomass Authorkassandraattwood ID270559 Card SetChapter 12 Descriptionchapter 12 electricity glossary terms, Ms. Day's class Updated2014-04-14T22:24:47Z Show Answers