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Transcript
Name:______________________________________
Period:_______
Date:________
Chapter 20 – Electricity
Sections 2 & 3 (Electrical Currents & Circuits)
Flow of a Charge
Electric Current ____________________________________________________
____________ ____________________________________________________
Electric charges will flow continuously only through a _________________________
called a ________________.
How a current flows:
A simple electric circuit contains:
a source of electrical energy = ____________, &
electrical conductor, = __________________.
In the figure, a ___________ ___________ is formed
by wires connecting a ____________ to a _____________.
Voltage
In an electric circuit, a battery increases the
______________________________ of electrons.
Voltage: ___________________________________________
_________________________________________________
_________________________________________________.
Voltage is measured in ______________.
Batteries
Chemical reactions in batteries produce ____________________________________
________________ which cause electrons to move from the _______________ to
________________ terminal.
Batteries contain only a limited amount of the chemicals needed to create this electric
field.
A battery is “dead” when ______________________________________________
,_________________________________________________________________
Resistance
Resistance _________________________________________________________
_________________________________________________________________.
The unit for resistance is the ______.
________________ generally have much higher resistance than ________________.
Ohm’s Law
Ohm’s Law states:
______________________________________________
According to Ohm’s Law, when the _________ in a circuit increases the ___________
increases.
Example – _________________________________________________________.
Electrical Circuits:
A closed path that – __________________________________________________
__________________________________________________________________
If the path is broken… _______________________________________________.
There are two types of circuits we will build:
1)
_______________________
2)
_______________________
Series Circuits
If all the parts of an electric current are connected one after another, the circuit is a
_______________ _______________.
In a series circuit, there is only __ ________ for the current to
take.
Advantage – ________________________________________.
Disadvantage #1 – ______________________________________
_____________________________________________________.
Disadvantage #2 – __________________________________________________
_________________________________________________________________.
Why? ___________________________________________________________.
Parallel Circuits
In a parallel circuit, the different parts of the circuit are on ___________________.
In a parallel circuit, there are ___________________________ for current to take.
Disadvantage – _______________________
___________________________________.
Advantage #1 – ________________________________,
______________________________________________.
Advantage #2 – _________________________________
______________________________________________.
Why?
Lab Activity
1. Build a Series Circuit
Using the two batteries and three bulbs at your station, build a Series Circuit
with the people at your lab station.
Take turns building the circuit.
Draw your circuit below:
2. Build a Parallel Circuit
Using the two batteries and three bulbs at your station, build a Parallel Circuit
with the people at your lab station.
Take turns building the circuit.
Draw your circuit below:
Chapter 20 – Electricity
Sections 2 & 3 (Electrical Currents & Circuits) – Review Questions
Review Question 1
Compare and contrast an electric discharge with an electric current.
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
Review Question 2
Describe how a battery causes electrons to move in a circuit.
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
Review Question 3
Compare the current in two light bulbs wired in a series circuit.
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
Review Question 4
Explain why a building is wired using parallel circuits rather than series circuits.
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________