* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Ch 7: Static Charge and Electron Transfer Ch 8: Ohm`s Law
Survey
Document related concepts
Valve RF amplifier wikipedia , lookup
Schmitt trigger wikipedia , lookup
Negative resistance wikipedia , lookup
Index of electronics articles wikipedia , lookup
Nanogenerator wikipedia , lookup
Operational amplifier wikipedia , lookup
Power electronics wikipedia , lookup
Nanofluidic circuitry wikipedia , lookup
Power MOSFET wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
RLC circuit wikipedia , lookup
Current source wikipedia , lookup
Surge protector wikipedia , lookup
Current mirror wikipedia , lookup
Electric charge wikipedia , lookup
Opto-isolator wikipedia , lookup
Transcript
Ch 7: Static Charge and Electron Transfer Ch 8: Ohm’s Law- Current, Voltage, and Resistance Ch 9: Series/Parallel Circuits; Power Name_________________ Section 7.1: Static Charge Pages__________ By the end of section 7.1 you should be able to understand the following: � Static charge is electric charge that is held in one place � An atom or material becomes charged when electrons transfer into it or out of it � Insulators keep charges in one place, whereas conductors allow charges to move more easily Words to Know Definition acetate conductors coulomb electrons grounding insulators static charge Van de Graaff generator Questions- Cornell Notes 1. Describe Benjamin Franklin's early theory of electricity. 2. In what way was this theory wrong? 3.How can an atom become: a)positively charged? b) negatively charged? a) b) 4.What role does friction play in electron transfer? 5. How do insulators and conductors compare? 6. Name the unit that charge is measured in. What number does it represent? 7.How does a Van de Graaff generator generate charge? 7.Name four uses of static electricity. Be varied in your answers. 8. What are two dangers of static electricity, and how can each be avoided? Section 7.2: Electric Force Pages_________ By the end of section 7.2 you should be able to understand the following: � Static charge is electric charge that is held in one place � Like charges repel. Opposite charges attract. Neutral objects are attracted to charged objects. � Electric force is a force at a distance. � Electric force can be increased by increasing the amount of charge on objects and by decreasing the distance between charged objects. Words to Know Definition action-at-a-distance forces charging by conduction charging by induction contact forces electric force force laws of static charge Cornell Notes 1. 1.What are the laws of static charge? 2. 3. 2. How is charging by induction and conduction different? Draw and label an example of each. 3. Why do neutral objects attract to charged objects? 4. Draw the steps which show a balloon getting charged and stuck to a wall that is neutrally charged. Section 8.1: Electric Potential Energy and Voltage Pages____ By the end of section 8.1 you should be able to understand the following: Static charge is electric charge that is held in one place Unlike charges gain electric potential energy when they are moved farther apart. Voltage (potential difference) is the change in potential energy per coulomb of charge. Electrical energy depends on the amount of charge and the voltage. electrochemical cells electrodes electrolyte energy volt voltage 1.What is another term for electric potential energy? 2.How is voltage produced? 4. Draw and label the parts of a dry cell and a wet cell. 5. Name 5 sources of electrical energy that we use today. 1. 2. 3. 4. 5. Section 8.2: Electric Current Pages_________ By the end of section 8.2 you should be able to understand the following: � Current electricity is the continuous flow of charge in a complete circuit. amperes circuit diagrams current electricity electric circuit electric current electric load 1. Describe how energy flows in a circuit. (see p. 281) 1. 4. 2. 5. 3. 2. Draw and name the symbols for the components in a circuit. Include a resistor. 3. How does current electricity differ from static electricity? 4. What is the unit for electrical current? What device is used to measure current? 5. What is conventional current? How is it used today? 1. 5. 2. 6. 3. 7. 4. 8. In the eight diagrams below, the electric light will not work. (a) Use the spaces provided to explain what is wrong with each arrangement. (b) Then explain what needs to be done in this case to create a working circuit. 3. 1. a)The wire does not touch the side of the bulb. b) Move the upper end of the wire to the metal side of the bulb. 2. 4. 5. 6. 7. 8. Section 8.3: Resistance and Ohm's Law Pages____ By the end of section 8.3 you should be able to understand the following: � Ohm’s law states that the electrical resistance of the circuit is the ratio of the voltage to the current. electrical resistance ohm Ohm's law resistance resistor 1. How is resistance related to current? 2. What is Ohm's Law and how is it used in resistance calculations? Give the equation. 3. By what two methods is resistance determined? 4. What is a resistor and how does the resistor colour code work? Section 9.1: Series and Parallel Circuits Pages_____ By the end of section 9.1 you should be able to understand the following: The current is the same in each part of a series circuit, and each load uses a portion of the same voltage. The current in each part of a parallel circuit depends on the resistance of that path. When resistors are placed in series, the total resistance of the circuit increases. When resistors are placed in parallel, the total resistance decreases. junction point parallel circuit series circuit Draw a circuit with 1. a) open switch b) two cells in series c) two bulbs in series d) 1 voltmeter around both bulbs 2. a) closed switch b) two cells in parallel c) two bulbs in series d) 2 voltmeters, one around each bulb 3. a) open switch b) two cells in parallel c) two bulbs in parallel 4. a) closed switch b) three cells in series c) two resistors in parallel 1. How is voltage and current distributed among the loads in a series circuit? Voltage: Current: 2. What happens to the total resistance in a series circuit when resistors are added? 3. How is voltage and current distributed among the loads in a parallel circuit? Voltage: Current: 4. What happens to the total resistance in a parallel circuit when resistors are added? IN SUMMARY… What happens to… …in a Series Circuit? …in a Parallel Circuit? …the flow of electrons if the circuit is broken …the current along the circuit? …the voltage lost across each resistor? …the total resistance if resistors are added total resistance will __________________ total resistance will ________________ …the current if resistors are added? current will ___________________ current will ________________ IN SUMMARY… (Answers) What happens to… …the flow of electrons if the circuit is broken? …the current along the circuit? …in a Series Circuit? …in a Parallel Circuit? the current stops- all electrons are blocked all electrons flow along alternate routes in the circuit the current is equal the current is split among the pathways (total current = sum of the paths) total voltage = …the voltage sum of the lost lost across voltages in each each resistor? load …the total total resistance resistance if will increase resistors are added …the current if current will resistors are decrease added? the voltage across each load are equal total resistance will decrease current will increase Section 9.2: The Power of Electricity Pages_____ By the end of section 9.2 you should be able to understand the following: � Electric power is the rate at which electric potential energy is transformed. � Power consumption multiplied by time of use equals the amount of electrical energy used by a device. Term Unit joule kilowatt•hour power power rating watt 1. What is electrical power and what unit is used? 2. How is electrical power calculated? Give the equation. 3. a) How is a kilowatt•hour used to charge consumers for electricity? c) Give a mathematical example. 4.a) What is an electric surge? b) How do you protect yourself against one? Definition and Equation