Chapter 12 Science
Card Set Information
Chapter 12 Science
Ms Day Science
Direct Current (DC)
DC (direct current) is the unidirectional flow or movement of electric charge.
-It only flows in one direction unlike AC current
-Alternating current (AC)
Alternating Current (AC)
AC is an electric current that reverses its direction many times a second at regular intervals
-It flows in different direction unlike DC
-Direct Current (DC)
An apparatus for reducing or increasing the voltage of an alternating current.
-Used for distributing electricity to homes
-Used for transportation of energy in general by Alternating Current
- Used to decrease the voltage
-Used to increase voltage
- Alternating Current
An automatic device for stopping the flow of current in an electric circuit as a safety measure.
A safety device consisting of a strip of wire that melts and breaks an electric circuit if the current exceeds a safe level.
Electric power is the rate at which electric energy is transferred by an electric circuit
The unit is defined as joule per second and can be used to express the rate of energy conversion or transfer with respect to time.
The kilowatt hour, or kilowatt-hour, (symbol kWh, kW. · h, or kW h) is a unit of energy equal to 1,000 watt-hours, or 3.6 megajoules.
Electrical energy can be used to move charged particles through a wire from a power plant to our homes and businesses.
- energy made available by the flow of electric charge through a conductor
One kilowatt-hour is defined as the energy consumed by power consumption of 1kW during 1 hour:
1 kWh = 1kW · 1h
One kilowatt-hour is equal to 3.6·106 joules:
1 kWh = 3.6·106 J
The energy E in kilowatt-hour (kWh) is equal to the power P in kilowatts (kW), times the time t in hours (h).E(kWh) = P(kW) · t(h)
The EnerGuide label is a tool to help you make an energy-wise choice when buying a new appliance. It shows how much energy appliances consume in a year of normal service (measured in kWh)
A smart meter is usually an electronic device that records consumption of electric energy in intervals of an hour or less.
-All houses and building have these in Kitchener
Time of Use Pricing
Time-based pricing includes fixed time-of use rates for electricity.
Phantom load, or leaking electricity, refers to the electric power consumed by electronic and electrical appliances while they are switched off or in a standby mode.
-Applies to anything that has a clock on it or some kind of energy consumer like an LED
Energy efficiency is a way of managing and restraining the growth in energy consumption.
The constant or permanent load on a power supply.
-Nuclear power plants supply base load
Hydroelectric power generation
Hydropower is electricity generated using the energy of moving water.
-Also supplies base load