Tim's+Wacky+World



SUMMARY ON COULOMB TAKES CHARGE
When you comb your hair with a plastic comb it creates static electricity and causes your hair to repel each other because the comb gives or take electrons from your hair Elementary charge is measured with a e (smallest charge found in nature) Coulomb is measured with a C One C charge = 6.242×10^18 elementary charges One elemenaty charge = 1.602×10^–19 C Electrostatic induction is when a comb is negatively charged and makes a positive and negative end on something like paper. Charge builds up in insulators and charge spreads out in conductors
 * CHAPTER 1**

**CHAPTER 2**

F=Force (N)
K=9.0×10^9 Nm²C-² q=the two charges of the coulomb (C) r=distance between t he charges (m) If F=r, (¼)F=2r, (1/9)F=3r

E=F/q E=strength of field(N/C) q=amount in charge (C) F=force(N) Conventional current is the directions the protons seem to move and electron current is the direction electrons move. They move in opposite direction.


 * CHAPTER 3**

I=q/t I=current in amperes(A) t=time (s) q=charge (C)

Direct current moves in the one direction and a alternating current moves back and forward on the spot. Each coulomb is called the electromotive force (EMF),it is measured in Volts(V) Voltage=EMF=Potential difference(P.D) V=J/C


 * CHAPTER 4**

Wires have little resistance so they don't take up too much energy R=V/I R=resistance measured in ohms I=current in amperes(A) V=Voltage measured in volts(V)

Two types of conductors ohmic and non-ohmic Ohmic conductor s have a constant resistance and the graph is linear eg. light bulbs, diodes, etc Non-ohmic conductors don't have a resistance that will vary the graph is non-linear Resistance depends upon 3 things the length, cross-sectional area(thickness) and the material it is made of. When wire is longer the resistance increases because it has to push through further Increasing the thickness will lower the resistance as there is more room for the charges to move. Good conductors have low resistivity and good insulators have high resistivity

R=(pL)/A R=resistance p=resistivity of the material L=length of the wire in metres(m) A=cross-sectional area of the wire (m²)


 * CHAPTER 5**

E=qV E=amount of electrical energy(J) q=Amount of charge(C) V=potential difference(V)

P=VI P= Power measured in watts(W) 5A means 5 coulombs pass through every second 12W means each coulomb carries a charge of 12J

**How does a stun gun work?**   Stun guns use normal 9V batteries. It uses multiple transformers to boost the voltage to between 20,000 and 150,000 volts. The power is released through the electrodes. The electrodes have a gap between them.If the gap is filled by someones body the electricity will travel from one electrode through the nerves in the body and out into the other electrode.  **Why does lightening strike towards the ground?**  Lightning is unpredictable as it can strike from cloud to cloud, ground to cloud or up toward the stratosphere. However it is more likely to strike near high objects.   **How do you survive/avoid being stuck by lightening?**   If you want to avoid being struck by lightning and you are not near a house or car, you should squat away from anything tall. However if <span style="FONT-FAMILY: 'Times New Roman',Times,serif"> you are near your house or car it is better to go inside one of these as it is safer. If you are in your house when lightning strikes don't use the phone or have a shower as lightning could strike your phone lines or water pipes.
 * HOMEWORK**

**How does wireless power work?** Wireless power uses a coil which transmit a frequency. Only certain coils that vibrate at that frequency wil obtain power from this.


 * Can we create power here to use in foreign countries?

How much electricity would it take to kill a large camel?

CHEAT SHEET

This is super awesome probally the best, i am guessing you copies and pasted it.**

Its ok.. //Not that mcuh content..// --1221008357

**Tim - you have done an excellent job on your wiki page! The summary is detailed and well organised> I like how the homework questions are in your own words - it shows you understand it. Perhaps there could be some more detail though. I challenge you to add some pictures and/or video!! Great effort 1220489517**