CURRENT ELECTRICITY.

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Presentation transcript:

CURRENT ELECTRICITY

charge that builds up on an object. Static electricity charge that builds up on an object. This charge is ‘discharged’ in an uncontrolled way (when you rub your feet on the carpet and then shock someone, or like lightening).

A circuit is a path for electricity to flow through. Current Electricity is the charge used in a controlled way – by floating it through a circuit. A circuit is a path for electricity to flow through. The charges flow from an energy source such as a battery to a device that uses the energy.

PARTS OF A CIRCUIT

Source The energy source in a circuit provides electrical energy. When something is plugged into the wall, it is getting the electrical energy delivered by power lines. A cell gets energy from chemicals which it turns into electrical energy. A battery is a combination of one or more cells.

A load is a device that converts electrical energy into another form. A toaster converts electrical energy into heat energy. A motor converts electrical energy into mechanical energy (the energy of movement). A light bulb converts electrical energy into heat energy and light energy.

The switch controls the flow of electric charges. When a switch is open, the pathway is not complete so no charge flows through the circuit. When a switch is closed the path is complete and current does flow through the circuit.

Drawing Circuit Diagrams

PART OF CIRCUIT SYMBOL Conducting Wire Cell Two-Cell Battery Open Switch Closed Switch Light Bulb (lamp) Ammeter Voltmeter Resistor When we draw diagrams of circuits, the different parts are represented by these different symbols.

A simple circuit with a single cell, a switch and a light bulb. Example #1 A simple circuit with a single cell, a switch and a light bulb.

Series & Parallel Circuits In circuits, it is possible to have 2 different pathways: Series: current must travel through every device in circuit Parallel: current splits and some will go through each device

Example #2 A circuit consisting of a battery of 2 cells in series, an open switch, and 2 lamps in parallel.