SNC1D – Static Electricity Page:___ Conductors and Insulators Metals are good conductors. Conductors are substances that let electrons move easily from one atom to the next atom. Examples of good conductors are gold, silver and copper. An insulator is a substance that does NOT let electrons move easily from one atom to the next atom. Examples are plastic, rubber and wood. In an insulator the electric charge stays in one location. This is how we are drawing the charge diagrams for static charges by friction or contact. Insulator - Negative Rubber 8+ 12- SNC1D – Static Electricity Page:___ In this example the rubber was rubbed on the left side by silk and got a negative charge. The excess electrons stay on the left side. Conductor - Negative Copper 8+ 12- In a conductor the electric charge is evenly distributed in the substance. In this example the copper plate was rubbed on the left side by silk and got a negative charge. However, the excess of electrons is evenly distributed and the whole copper plate is charged. Discharging means a charged object has the electrons and protons equalized. This is SNC1D – Static Electricity Page:___ done by adding or removing electrons. Grounding means a charged object shares its electrical charge with the Earth and becomes neutral. The charged object discharges any excess electrons or gains electrons. Read Nelson pg 280-283 Do p 281 #2-4, p283 #1-3 SNC1D – Static Electricity Page:___ Conductors and Insulators Metals are good conductors. Conductors are _______________________________________ _________________from one atom to the next atom. Examples of good conductors are _____________________________ An insulator is a substance that _________________________________________________ _____________________________________________________________. Examples are ____________________________________________ . In an insulator the electric _________________________________________. This is how we are drawing the charge diagrams for static charges by friction or contact. __________________________________ In this example the rubber was __________________________________________________ ______________________________. The excess electrons stay on the left side. _________________________________________ In a conductor the ____________________________________________________________ ___________________________. In this example the copper plate was rubbed on the left side by silk and got a negative charge. However, the ______________________________________ ________________________and the whole copper plate is charged. Discharging means a charged object has the electrons and protons ____________________. This is done by __________________ or ________________ electrons. Grounding means ______________________________________________________________________________ and becomes ________________. The charged object discharges any excess electrons or gains electrons. Read Nelson p 280-283, do p 281 #2-4, and p. 283 #1-3 SNC1D – Static Electricity Page:___ Homework Questions Nelson p281 – #2-4, 283 – #1-3 (Read pp. 281-283) 2. (a) Why does the amount of static charge continue to increase on a glass surface as you rub it? (b) What would eventually happen if you continued rubbing it? 3. If you charged the end of a plastic comb and then put the same kind of charge on one place on the surface of a round metal ball on an insulating stand, what would happen to the charge in each case? Explain why with the help of a diagram. 4. Why are problems with static electricity more common in winter than at other times of the year? How could any of these problems be reduced? -------1. What is the meaning of the term “discharge”? 2. Why does Earth not become charged when so many electrons are constantly flowing into it as various devices are grounded? 3. (a) Why does the flow of gasoline through the hose and nozzle of a gas pump produce a static charge? (b) Why is there no static discharge at a gas station when the nozzle of the pump is brought up to the car’s fuel tank opening?