Electricity and Magnetism (electric circuits (series circuits (parallel…
Electricity and Magnetism
electric appliance transforms electric energy into another form.
breaking a circuit
if you use too many appliances at once, a circuit's current can become dangerously high and heat the wires that carry it. overloading a circuit can make a fire, in order to prevent this is you can use devices called fuses and circuit breakers.
there are usually two high voltage wires that form a circuit to form the electric power plant.
the first battery
the first battery had chemical energy that was stored in chemical compounds.
a battery is a device that putys electrical charges in certain devices.
current, voltage and resistance are related to one another. these are the things that you will need to know to understand electric circuits. resistance equals voltage over current
features of a circuit
all electric circuits have the same basic features. they all have devices that are run by electrical energy like, a radio, computer, light bulbs, and a refrigerator.
if all parts of an electric circuit are connected one after another along a path, the circuit is called a series circuit.
as you gaze at a string of lights you will notice that some are shining bright and others are burnt out. these bulbs are in a parallel circuit. in a parallel circuit, the different parts of a circuit are on separate branches.
electricity from magnetism
electric current introduction
before you can understand how electrical energy is supplied by your electric company, you need to know how it is produced.the key is motion. an electric current is induced in a conductor when the conductor moves through a magnetic field.
an electric generator is a device that converts mechanical energy into electrical energy.
the electrical energy generated by electric companies is transmitted over long distance at very high voltages.
electronic signals and semiconductors
analog and digital signals :
there are two basic kinds of electronic signals: analog signal and digital signal.
how can an electronic device transmit analog or digital signals? ordinary current flows.
a telephone is a device were you can call people or friends and talk to them through wires.
a device that records your voice.
voices or music on an am or pm radio station.
basically a radio with a screen