Depth Charge Voltaic Crusher Short Circuit The Magnetic Zeroes Electro-Mag Grab Bag

### 100

An area around an electric charge that can exert an electric force.
What is an electric field?

### 100

Current
What do amperes measure?

### 100

They allow you to turn a circuit on and off easily.
Why are switches useful in a circuit?

### 100

North and North poles will repel. North and South poles will attract. South and South poles will repel.
Explain how North and South poles on magnets interact.

### 100

Static electricity occurs when charged objects do NOT pass charges between them. This results in objects being attracted to each other.

In this case, electrons are moving from one object to another. This is an example of electric discharge.
Zap! You just got shocked! Why is this NOT an example of static electricity?

### 200

If the charges move closer together or if the charges are bigger in size.
What will cause an electric force to become greater?

### 200

Electrodes and electrolytes are the parts of a cell. The electrolytes is a conductive chemical that reacts with the electrodes. One electrode becomes more positive, the other more negative. The negative charges flow from one electrode to another.
What are the parts of a cell/battery and how do they work together?

### 200

The wires, loads, and power source.
Name the three essential parts of a circuit.

### 200

The domains inside of iron can be aligned using another magnet. This makes the iron a temporary magnet.
What makes a material like iron able to be magnetized, but not plastic?

### 200

When the plastic wrap is unrolled, it pulls off electrons and becomes negatively charged. This INDUCES a charge on the surface of the bowl because even though the bowl is neutrally charged, the negative charges move away from the plastic wrap which makes the area closest to the plastic wrap positively charged.

The picture above shows how the negative charges move away from the charged object on the left.
Explain how plastic wrap works so that it sticks to the bowl.
*Hint: Think about what happened when we pulled two pieces of tape apart.

### 300

Electrons are the particles that move in an electric discharge. They move from a negatively charged region to a positively charged region.
Which particles move during an electric discharge? From where to where do they move?

### 300

A 12 V battery because there is more potential difference, there will be a larger current according to Ohm's Law.
What makes a larger current, a 1.5 V battery or a 12V battery assuming that the resistance is the same?

### 300

A fuse has a thin piece of metal that melts if the current is too high. They must be replaced. A circuit breaker has a piece of metal that bends away to open the circuit. The circuit breaker can be reset without replacing the entire thing.
What is the difference between a fuse and circuit breaker?

### 300

The ends of the horseshoe magnet have opposite poles. You can see the magnetic field lines connect and this shows the attraction between the north and south poles of the magnet.
What can you infer about the poles on a horseshoe-shaped magnet based on the magnetic field lines?

### 300

Charged particles from the sun interact with the oxygen and nitrogen atoms in the Earth's atmosphere and produce different colors of light.
The reason why we often seen auroras at the poles is that the magnetic field bends inward at the poles. This allows more charged particles through the magnetic field and they are able to hit the atmosphere.
Watch this video:

Explain how an aurora formed and why they are most often seen at the North and South pole.
*As a side note: A solar flare is a sudden brightening on the sun's surface. It releases a lot of charged particles.

### 400

Lightning rods are conductors that attract lightning. They are connected the ground through a wire so when lightning strikes, the electric discharge is sent into the ground. They are positioned to be higher than surrounding surfaces so that lightning will mostly likely strike it first.
How do lightning rods work to protect people?

### 400

There must be a potential difference. One electrode must be positively charged (anode) and the other electrode negatively charged (cathode). The electrons flow from the cathode to the anode.
What must the electrodes have in order to create an electric current? From which electrode do the electrons flow from and to?

### 400

Series: Batteries in series can increase the voltage. One switch can shut off all of the loads. Parallel: Each load can be turned on/off without affecting the other loads.
What is one advantage of a series circuit and one advantage of a parallel circuit?

### 400

The magnetic field of the strong magnet causes the domains inside the compass needle to become rearranged. Now the compass needle is no longer aligned with the magnetic field of the Earth, but the magnetic field of the strong magnet.
Why does placing a strong magnet near a compass needle sometimes result in demagnetizing the needle or reversing the N/S poles?

### 400

It will never blow the fuse because now the current will flow through the lightbulb which acts as a resistor (electrons flowing through the filament in the lightbulb runs into friction.) Now the current has been slowed down so that the fuse doesn't blow.
The toaster will still work, but since the current has been slowed down by the light bulb, it will not get as hot as before.
A defective toaster may blow your house fuse if it has short circuit in it. But what happens if you add a light bulb to the same circuit:
1) When it is plugged in, will it sometimes, never, or always blow the fuse?
2) Will the toaster be able to work?

# Electricity and Magnetism

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