Physics Grade 9

Current in which charged particles travel through a circuit in only one direction.

Current in which electrons move back and forth in a circuit.

An electrical device that changes the size of the potential difference of an alternating current. 

A safety device that is placed in series with other circuits, which leads to appliances and outlets.

A safety device that is found in older buildings and some appliances; like a circuit breaker, it is placed in series with other circuits that lead to appliances and outlets.

The rate at which an appliance uses electrical energy. 

A unit for electrical power.

A practical unit of electrical power. ^{_{1KW = 1000W}}

The energy that is used by an appliance at a given setting, _{^{multiply power rating by length of time used.}} 

The practical unit of electrical energy.

A label that gives details about how much energy an appliance uses in one year of normal use. 

A meter that records the total electrical energy used hour by hour and sends this information to the utility company automatically.

A system of pricing in which the cost of each kw x h of energy used is different at different times of the day. 

The electricity that is consumed by an appliance or device when it is turned off. 

The ratio of useful energy output to the energy input, expressed as a percentage.

The continuous minimum demand for electrical power. 

A demand for electricity that is greater than the base load and is met by burning coal and natural gas.

The greatest demand for electricity which is met by using hydroelectric power and natural gas. 

The generation of electrical power using a source of moving water.

A source of energy that can be replaced in a relatively short period of time.

A source of energy that cannot be replaced as quickly as it is used. 

Many large wind turbines at one location. 

Energy that is directly converted from the Sun into electricity. 

The generation of a direct current when certain materials are exposed to light. 

Energy that is generated from plant and animal matter.