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Chapter 5 Study Guide : Your test is January 30, 2104
Chapter summaries
CHAPTER 5
Electricity and magnetism
1 WHAT IS ELECTRICITY?
•How is an electric charge formed? Negatively charged vs. Positively charged particles?
• The elementary charge is the charge carried by a single electron or proton. It has a value of
1.602 x 10–19 C (p. 141).
• The coulomb is the unit of measurement for electrical charge. One coulomb is equal to the
charge of 6.25 x 1018 electrons or protons (p. 141).

Could you calculate the number of individual charges/coulomb using these
values?
• Charging an object consists in creating an imbalance in the electrical charge of that object
(p. 142).
• What is the difference between conductors and insulators? Could you identify these
types of materials in different scenarios?
• An electrical field is the area of space in which the electrical force of a charged body can act
on another charged body (p. 144). How do charges react to one another? Like charges?
Opposite charges?
2 STATIC ELECTRICITY
• Static electricity describes all the phenomena related to electrical charges at rest (p. 145).
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solely for classroom use with Observatory.
• An object can be charged in various ways: by friction, by conduction or by induction (p. 146).
Can you identify these three methods of charging in different scenarios?
3 DYNAMIC ELECTRICITY
• What is it? What is electric current?
• Current intensity is the number of charges that flow past a given point in an electrical circuit
every second (p. 151).
• The potential difference is the amount of energy transferred between two points in an
electrical circuit (p. 152).
• Electrical resistance is the ability of a material to hinder the flow of electric current (p. 153).
What are the factors that increase electrical resistance and how does this affect current
intensity?
• Ohm’s law states that, for a given resistance, the potential difference in an electrical circuit is
directly proportional to the current intensity (p. 154).

Can you use the different formulas seen in class to solve problems?
Observatory / Guide
11129-B
1
Chapter summaries
CHAPTER 5
Electricity and magnetism
Name: _______________________________________
Group: ______________
Date: ___________
• What is the difference between series and parallel circuits? Can you draw recognize
circuit diagrams?


Can you interpret circuit diagrams and find the missing values, V, I or R, in order
to solve a problem?

Could you create and interpret graphs that relate the different variables seen
when studying electric circuits (V, I, R, or P)
Can you design a procedure for the lab that would test the validity of these laws?
Can you explain using your knowledge of current intensity, potential difference and
resistance?
4 WHAT IS MAGNETISM?
• Magnetism describes all the phenomena caused by magnets (p. 163).
• A magnet is an object that can attract other objects containing iron, cobalt or nickel (p. 163).
• All magnets have a north-seeking and a south-seeking pole. The north pole of a magnet is
the end that naturally seeks the Earth’s magnetic pole near the geographic North Pole. The
other end of the magnet is its south pole (pp. 165–166).
• A magnetic field is the area of space in which the magnetic force of a magnet can act on
another magnet (p. 166).

Are you capable of drawing and identifying magnetic fields? Could you identify and
interpret magnetic forces of attraction and repulsion?
5 ELECTROMAGNETISM
• Electromagnetism describes all the phenomena resulting from the interaction between
electricity and magnetism (p. 167). (Electric charges and magnetic poles are not the same
thing!)
• A solenoid is a cylindrical coil of live wire (p. 169).
• To transform a solenoid into an electromagnet, a ferromagnetic substance is inserted inside
the solenoid, creating a core (p. 170).
• Electromagnetic induction consists in generating an electric current in a conductor by varying
a magnetic field around that conductor (p. 171).

Could you use the left/right hand rule to figure out the direction of a magnetic field
on a straight wire? A solenoid?

Could you explain how to increase the strength of a magnetic field on an
electromagnet?

Are you capable of drawing magnetic field lines for straight wires? Solenoids?

Could you explain and interpret the function of an electromagnet that is incorporated
in the electric circuit of a technical object?
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