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Transcript of Electricity Review
How does electricity influence our lives? the capacity to do work Renewable vs. Nonrenewable Renewable Resource Renewable Resource:
A resource that is naturally replaced in a relatively short time. Nonrenewable Resource:
A natural resource that is not replaced as it is used. solar
natural gas energy... transformed ...can... ...be... The transformation of energy is when energy changes from one form to another. A light bulb transforms electrical energy to light energy. A motor or a fan transforms electrical energy to mechanical energy. A toaster, an iron and an oven transforms electrical energy to heat energy. What is
electricity? static vs current static electricity is the buildup of electric charges on an object, followed by a discharge. Current electricity is a form of energy caused by the movement of electrons through a closed pathway. Current flows from negative to positive. - + electrons electrons A closed circuit has a closed, continuous path. A circuit contains conductors and insulators. Conductors allow electricity to flow easily. An insulator is a material that does not allow electricity to flow easily. A circuit is a closed pathway through which electricity can flow. Every circuit needs an:
- energy source
- resistor A resistor is the part of the circuit that does the work, such as a light bulb. ll series parallel A circuit in which there is only one path for the current to flow.
When one bulb is taken out, they all go out.
If another bulb is added, all the bulbs become dimmer. A circuit in which there is more than one path for the current to flow.
When one bulb is taken out, the rest stay lit.
If another bulb is added in parallel, all the bulbs remain bright. short circuit A short circuit is a circuit in which the current can bypass the load by taking a shorter, unintended path. A circuit breaker or fuse is a safety device that opens an overloaded or hot circuit.
A lightning rod is a safety device that protects buildings from lightning by directing lightning to the ground.
Water is a conductor. You could become part of the circuit if you handle electrical appliances while in the water.
Grounding is when electric current is sent to the ground to protect a person from electric shock. An electromagnet is a strong magnet that can be turned on or off. Current flowing through the wire coil of an electromagnet creates a magnetic field. ? Thank you! http://goo.gl/sESGL Safety Electromagnet