Electricity (PS .11a and 11d)
Test date________________________
Essential Concepts and Skills
Static electricity- buildup of charges on an object due to friction
Electric discharge- releasing the charges that have built up to reach a balance
Electrons (negatively charged particles)are the charges that are building up on
an object
Law of electric charges: opposite charges attract, while like charges repel
Resistance is a property of matter that affects the flow of electricity
 Ohm’s Law states the relationship between current, voltage, and
resistance I= V/R
 Wire with most resistance- thin, long
Methods of charging:
 Objects can be charged by conduction (direct contact), induction
(charges rearrange without direct contact), and friction (rubbing)
Parts of a circuit:
load (ex. Light bulb), wires, power source (ex. Cell)
Types of circuits:
 Parallel: loads are located on separate branches or paths
 Series: loads are located on one path
Conductors- allow charges to flow easily (ex. Copper)
Insulators- do not allow charges to flow easily (ex. Wood)
Assignments
Starter Quizzes
Labs ()
Notes
GIZMOs
Pages: 422-445
STUDY GUIDE: ELECTRICITY
Static Electricity
1. Identify the charge of the electron.
2. Objects can become charged by friction, conduction, or induction. Give an example of
each.
3. Using the law of electric charges, explain what is happening in the following pictures:
4. Differentiate between static electricity and electric discharge. Give an example of each.
5. Differentiate between conductors and insulators. Give examples of each.
Current Electricity
6. Considering Ohm’s Law, why would two similar appliances require different numbers of
batteries?
7. Draw a basic series circuit and a basic parallel circuit. Underneath your drawing,
contrast the circuits.
8. Plan a demonstration that would show the inverse relationship between resistance and
current and the direct relationship between voltage and current.
9. How could you decrease the resistance of the wires in your circuit?
10. Your home uses which type of current?
11. What is the potential difference of a circuit that has 100 Ω of resistance and 0.2 A of
current?
12. Compare the amount of current produced by a 1.5 V cell to the amount of current
produced by a 9 V battery.
13. How much electrical energy is used by a 150-watt stereo system that stays on for 3.5
hours?