Electricity Chapter 12
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Direct Current (DC)
Current from a cell in which charged particles move from the negative terminal to the positive one.
Alternating Current (AC)
- Moving a magnet in and out of a coil of wire generates a current in the coil
- The current moves one way when a pole of the magnet is inserted into the coil and the opposite direction when the magnet is removed from the coil
- Electrons moving back and forth with no net direction
- A simple electrical device that can change the potential difference of an AC
- Do not work with DC
- Can reduce the V of increase the V
A safety device that is put in series with other circuits that lead to appliances and outlets
A safety device in older buildings/ appliances; like a circuit breaker, it is placed in series with other circuits and leads to appliances and outlets.
The rate at which a device uses electrical energy.
The measurement for electrical power.
The energy that is used by a device at a given setting.
Measurement for electrical energy.
A label that gives details about how much energy in an appliance is used over one year of normal use.
- A meter that records the total amount of electrical energy used hour by hour
- Automatically sends info to utility companies
Time of Use Pricing
A system of pricing in which the cost of each KWh energy used is different at different times in a day.
- The electrical energy that is consumed while a device is not turned on
- Best way to prevent it is to unplug the device
- The ratio of useful energy output to total energy input
- Energy input id the power multiplied by time appliance is on
- The continuous minimum demand for electrical power
- Ontario = 12 000W
- In Ontario is is primarily generated using hydroelectric and nuclear power
The production of electricity using a source of running water.
- A demand for electricity higher than the base load
- Met by burning coal and natural gasses
The greatest demand for electricity.
Renewable Energy Source
- Energy that can be renewed in a relatively short amount of time
- Eg. hydroelectrical power
Non-Renewable Energy Source
- Energy that cannot be renewed as quickly
- Eg. fossil fuels
- Positives - renewable, environmentally friendly, at 100% efficiency 1 m2 can supply power for most electrical appliances
- Negatives - most only work at 25% efficiency, not concentrated, high cost, require sunlight which isn't always present
The generation of a DC when certain materials are exposed to light.
- Positives - only returns as much carbon to the atmosphere as was originally in the organism (neutral), results in less acid rain, no heavy metals emitted, renewable
- Negatives - resources to burn aren't very available
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