Show:
Current Electricity
Static Electricity
Lightning
Circuits
Surprise
100
In order to flower, electricity must follow a _____________.
complete path OR closed circuit
100
name one example of "static electricity"
rubbing balloon with hair thundercloud/lightning rubbing balloon with wool walking across carpet
100
What does lightning like to do?
take the shortest path
100
If you remove a bulb from a series circuit, what happens to the other bulb?
both bulbs go off
100
After turning on all of the energy wasting appliances in the house for 15 minutes, everything turned off, what do you think happened? What should you do to fix the problem?
circuit breaker is off or fuse melted, you should turn some appliances off and push the circuit breaker on and replace the fuse.
200
If there are gaps or breaks in a path, it is called an ________ circuit, and no electricity will flow.
open
200
What does the word "static" mean? How does this help you understand "static electricity".
not moving static electricity is electricity that doesn't flow continuously
200
what kinds of particles rub against each other in a thundercloud?
ice and water particles
200
Will the bulbs connected in a parallel circuit be brighter or dimmer than bulbs connect in a series circuit? Why?
brighter because each bulb is on a separate circuit, energy from the battery is not shared by both bulbs
200
Why does water get rid of static?
Water is a conductor and moves the electrons off quickly
300
What is a short circuit and why is it dangerous?
It is a circuit that has very low resistance, allowing too much current to flow. It is dangerous because it can cause wires to heat up and start a fire.
300
Explain why your hair sticks up after rubbing it with a ballon.
Your hair sticks out because your hair strands are positively charged and they repel each other.
300
What is the tool that safely discharges lightning to the ground called?
lightning rods
300
How many ways can current flow in a parallel circuit?
more than 1
300
How does a fuse work?
a thin metal strip melts upon contact with too much current and causes an open circuit
400
What do resistors allow electrical energy to be changed into? Give an example.
other forms of energy EX: the filament (resistor) changes electrical energy to heat and light.
400
explain in 3 steps why you feel a shock when you touch a doorknob after you walked across a carpet.
1. your feet rubs against the carpet (knocking electrons, collected on your feet) 2. Electrons flows through your body (you are a poor conductor) 3. You touch a doorknob and the electrons discharge or jump into it because it is a conductor. The jump of electrons create a shock.
400
Name four ways to be safe during a thunderstorm.
answers may vary
400
How are the electrical appliances at school connected? How do you know?
answers may vary
400
Think of the experiment we did with the ballon and water. After rubbing the ballon with hair, we placed the charged balloon next to the stream of water. What happened and why?
The stream of water was attracted to and moved toward the ballon. The water molecules flip so that their positive side is closer to the water.
500
1.Explain how a dry cell works. 2.Name all of the components inside a d-cell. 3.What are the ends of the cell called?
1. A dry cell changes chemical energy to electrical energy. 2.Carbon rod Zinc container chemical paste 3. terminals
500
Which of these materials tend to gain electrons? there are 4 rubber wool gold hair saran wrap polyester
rubber saran wrap polyester gold
500
Why does the thunder usually come after lightning?
sound travels slower
500
Look at this picture, https://www.le.ac.uk/se/centres/sci/selfstudy/ps19.gif is this a parallel or series circuit? What do you think the symbols mean?
parallel, load and battery
500
How many electrons does a gold atom have?
78 electrons