

The Basics of Electricity: Part 3
Presentation
•
Science
•
6th - 8th Grade
•
Practice Problem
•
Medium
Samantha Bryan
Used 23+ times
FREE Resource
9 Slides • 5 Questions
1
The Basics of Electricity: Part 3

2
What is Resistance?
The opposition to the flow of an
electric current, producing heat.
The greater the resistance, the less
current gets through.
Good conductors have low
resistance.
Resistance is measured in Ohms.
3
What influences Resistance?
Material of wire: Aluminum & copper = low resistance
Thickness of the wire: thicker wire = low resistance
Length of wire: shorter wire = low resistance
Temperature: lower temperature = low resistance
4
Multiple Choice
Resistance is the ________ to the flow of electrical current.
redirection
opposition
change
movement
5
Multiple Select
Resistance is influenced by...
Material of wire
Thickness of material
Length of wire
Temperature
6
Voltage
The measure (“push”) of energy
given to the charge flowing in a
circuit.
The greater the voltage, the greater
the force or “pressure” that drives
the charge through the circuit.
Volatage is measured in volts.
7
Multiple Choice
Voltage is the push that causes electrical currents to flow.
True
False
8
Electromagnets
Electromagnets are made from a
current-bearing coil of wire
wrapped around an iron or steel
core.
The more times the wire is wrapped
around the iron core the stronger
the electromagnet.
9
How It Works
The current passing through the coils of wire
magnetizes the iron nail.
More coils around the wire
equals stronger magnetic field.
10
Multiple Select
Electromagnets can be made with which 3 components?
A battery
Wire
A nail
A plastic cup
11
Generators
A generator is a machine that
changes mechanical energy to
electrical energy
Usually use moving magnets to
create currents in coils of wire.
12
Multiple Choice
A generator is a machine that
changes mechanical energy to
electrical energy
True
False
13
Motors
A motor is a device that changes
electrical or chemical energy to
mechanical energy.
14
Electricity & Magnetism
Electricity and magnetism are closely
related.
Both are caused by negative and positive
charges in matter.
Electricity can produce magnetism and
magnetism can create electricity
(electromagnets)
The Basics of Electricity: Part 3

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