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EXAM STUDY TIME, electric circuits
again, it explains itself.
19
Physics
9th Grade
07/24/2009

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Term
Electric Circuit.
Definition
The path along which electrons flow, each device is connected to the same two points.
Term
Closed circuit.
Definition
A path with no openings in it, electrons can flow.
Term
Open Circuit
Definition
A path with one or more openings in it, electrons can't flow.
Term
What are the two types of Circuits?
Definition
Series and Parallel.
Term
Series Circuit.
Definition
Energy only has one way to flow.
Term
What does current do in a series Circuit?
Definition
It stays the same.
Term
Req in a series circuit=
Definition
R1+r2+R3 etc.
Term
What happens if one device fails in a series circuit?
Definition
Current stops and all of the devices fail.
Term
What does voltage do in a series circuit?
Definition
Divides among the branches.
Term
Parallel Circuit.
Definition
Energy has more than one path to flow.
Term
What happens to current in a parallel circuit?
Definition
It divides among the braches.
Term
What happens to voltage an a parallel circuit?
Definition
It stays the same.
Term
How are the number of branches in a circuit and the total resistance related?
Definition
Inversly proportional.
Term
What is the relationship between Req and Resistance of each branch?
Definition
Req
Term
overloaded circuit.
Definition
When a circuit is carrying more than a safe amount of current.
Term
How does a fuse stop an overloaded circuit.
Definition
A tiny metal strip melts when a certain amout of current flows through it thus opening the circuit and stopping the flow of current.
Term
What does a circuit breaker do?
Definition
It opens the swithch to stop the flow of current.
Term
What are the two types of circuit breakers?
Definition
Magnets and bimetalic.
Term
How do you find the total resistance in a parallel circuit?
Definition
1/req+1/R1+1/R2 etc.
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