19 terms

Electricity Review

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Terms in this set (...)

circuit breaker
stops the flow of charges by switching off the current if it gets to high.
conductors
materials that allow electric charges to flow through them easily
electric current
the flow of electric charge
fuse
melts if the electric current in the circuit gets too high. This causes an open circuit.
parallel circuit
circuit in which electric current can follow through more than one path
resistance
the ability of a substance to oppose or slow down electrical current
series circuit
when all the electrical charges flow in the same direction along a single path
static electricity
The buildup of electric charges on an object
what is an example of static electricity?
When lightning strikes
When you get a shock from something metal
transformers
change the voltage of electrical current
voltage
the strength of a power source
What are the differences between an open and closed circuit?
A complete unbroken circuit is called a closed circuit. If the circuit has any breaks or openings is is called a open circuit. Electric current cannot flow in an open circuit.
What is an example of an open circuit?
When a light bulb burns out, it makes an open circuit because the wire inside breaks in two. The circuit no longer has a complete path.
What is a short circuit?
A path with almost no resistance. A short circuit can stop the rest of the circuit from operating properly. It can be dangerous. The wire heats up and may cause a fire.
How does electrical energy travel through a power station?
Electric current travels in a circuit through wires and transformers. Transformers are used to change the voltage of electric current so it is safe for your home.
What happens when you plug too many devices into one circuit?
This can cause too much current to go through a wire. The wire can overheat and may start a fire.
What is the difference between a series and parallel circuit? Draw them.
In a series circuit, the parts are connected like links in a chain. The electric current passes through each part one at a time.
In a parallel circuit, each part or branch has its own path for electric current. The electric current passes through all of them at the same time
How are fuses used in circuits?
Fuses are used to protect against dangerous amounts of electric current. A fuse melts if the electric current in the circuit gets too high. This causes an open circuit.
How do positive and negative charges work? How do they cause a shock?
A positive charge and a negative charge attract or pull each other. Positive charges repel or push away each other. Negative charges repel each other too.
A small shock comes from a discharge or movement of static electricity from one object to another.