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Physical Science 3rd Partial Study Guide
Ch. 20 – Electric Charges and Current
Sec. 1 – Electric Charge and Static Electricity
• Vocabulary
o Electric Field
o Static Electricity
o Conduction
o Induction
o Conservation of Charge
o Static Discharge
o Electroscope
• Themes
o Types ofElectric Charge
▪ What are the charges of electrons? Protons?
o Interactions Between Charges
▪ How do charged objects interact with objects with the same charge? Different charge?
▪ How are electric charges similar to magnets? How are they different from magnets?
o Electric Fields
▪ How do electriccharges exert their force?
▪ What is the shape of an electric field around a single object?
▪ What is the shape of an electric field around multiple objects?
o Static Charge
▪ How do objects become negatively charged? Positively charged?
▪ How is static electricity different from electric current
▪What are three ways that static charges are transferred?
▪ What is static cling?
o Static Discharge
▪ How does static discharge take place?
▪ How does humidity affect static discharge?
▪ How is static discharge related to sparks and lightning?
o Detecting Charge
▪ How do electroscopesdetect a charge?
• Know how to answer the section review questions on page 651.
Sec. 2 – Circuit Measurements
• Vocabulary
o Electrical Potential
o Potential Difference
o Voltage
o Voltage Source
o Voltmeter
o Ammeter
o Ohm’s Law
• Themes
o Electrical Potential
▪What causes electrons to flow in a circuit?
o Voltage
▪ What are the units of voltage?
o Voltage Sources
▪ What creates a voltage in a circuit?
▪ How does voltage affect the strength of a current?
o Resistance
▪ What is resistance?
▪ How are resistance and current related?▪ What kinds of factors affect resistance?
▪ What does it mean that electricity follows the path of least resistance?
o Ohm’s Law
▪ What is the formula that Ohm’s law defines?
▪ What are the units for each term in ohm’s law?
▪ Know how to use Ohm’s law?
• Know how to answer the sectionreview questions on page 659
Sec. 3 – Series and Parallel Circuits
• Vocabulary
o Series Circuit
o Parallel Circuit
• Themes
o Series Circuits
▪ How does a series circuit work?
▪ What are some benefits to series circuits? Some negatives?
▪ Why do the lights get dimmer as more lights are added?▪ If one light burns out, what happens to the other lights?
o Parallel Circuits
▪ How does a parallel circuit work?
▪ Why do the lights not get dimmer as more lights are added?
▪ If one light burns out, what happens to the other lights?
o Household Circuits
▪ What kind of circuits do ourhomes have? Why?
• Know how to answer the section review questions on page 665
Sec. 4 – Electrical Safety
• Vocabulary
o Short Circuit
o Third Prong
o Grounded
o Lightning Rod
o Fuse
o Circuit
o Breaker
• Themes
o Becoming Part of a Circuit
▪ How can your body...
Ch. 20 – Electric Charges and Current
Sec. 1 – Electric Charge and Static Electricity
• Vocabulary
o Electric Field
o Static Electricity
o Conduction
o Induction
o Conservation of Charge
o Static Discharge
o Electroscope
• Themes
o Types ofElectric Charge
▪ What are the charges of electrons? Protons?
o Interactions Between Charges
▪ How do charged objects interact with objects with the same charge? Different charge?
▪ How are electric charges similar to magnets? How are they different from magnets?
o Electric Fields
▪ How do electriccharges exert their force?
▪ What is the shape of an electric field around a single object?
▪ What is the shape of an electric field around multiple objects?
o Static Charge
▪ How do objects become negatively charged? Positively charged?
▪ How is static electricity different from electric current
▪What are three ways that static charges are transferred?
▪ What is static cling?
o Static Discharge
▪ How does static discharge take place?
▪ How does humidity affect static discharge?
▪ How is static discharge related to sparks and lightning?
o Detecting Charge
▪ How do electroscopesdetect a charge?
• Know how to answer the section review questions on page 651.
Sec. 2 – Circuit Measurements
• Vocabulary
o Electrical Potential
o Potential Difference
o Voltage
o Voltage Source
o Voltmeter
o Ammeter
o Ohm’s Law
• Themes
o Electrical Potential
▪What causes electrons to flow in a circuit?
o Voltage
▪ What are the units of voltage?
o Voltage Sources
▪ What creates a voltage in a circuit?
▪ How does voltage affect the strength of a current?
o Resistance
▪ What is resistance?
▪ How are resistance and current related?▪ What kinds of factors affect resistance?
▪ What does it mean that electricity follows the path of least resistance?
o Ohm’s Law
▪ What is the formula that Ohm’s law defines?
▪ What are the units for each term in ohm’s law?
▪ Know how to use Ohm’s law?
• Know how to answer the sectionreview questions on page 659
Sec. 3 – Series and Parallel Circuits
• Vocabulary
o Series Circuit
o Parallel Circuit
• Themes
o Series Circuits
▪ How does a series circuit work?
▪ What are some benefits to series circuits? Some negatives?
▪ Why do the lights get dimmer as more lights are added?▪ If one light burns out, what happens to the other lights?
o Parallel Circuits
▪ How does a parallel circuit work?
▪ Why do the lights not get dimmer as more lights are added?
▪ If one light burns out, what happens to the other lights?
o Household Circuits
▪ What kind of circuits do ourhomes have? Why?
• Know how to answer the section review questions on page 665
Sec. 4 – Electrical Safety
• Vocabulary
o Short Circuit
o Third Prong
o Grounded
o Lightning Rod
o Fuse
o Circuit
o Breaker
• Themes
o Becoming Part of a Circuit
▪ How can your body...
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