# Electricity and Magnetism Sparkmixer

## 25 terms

### A basic property of the tiny particles that make up matter. Electric charges can be positive or negative.

What is an electric charge?

### The buildup of electric charges in one place.

What is static electricity?

### The area around electric charges, where electric forces can act.

What is an electric field?

### There is a buildup of more positive charged particles than negative charged particles.

How does an object become positively charged?

### There is a build-up of more negative charged particles than positive charged particles.

How does an object become negatively charged?

### The objects are attracted to each other because opposites attract.

What happens when a positively charged object is placed near a negatively charged object?

### The objects repel each other because like charges repel.

What happens when a positively charged object is placed near a positively charged object?

### The objects repel each other because like charges repel.

What happens when a negatively charged object is placed near a negatively charged object?

### The balloon has lost some negative charges so there are more positive charges than negative charges.

Explain how an object like a balloon can become positively charged.

### The balloon can pick up extra negative charges so there are more negative charges than positive charges.

Explain how an object like a balloon can become negatively charged.

### A parallel circuit. There is more than one path for the electric current to follow in order to light a bulb. If one light goes to the other light will glow.

What type of circuit is this? Explain your choice.

### A series circuit. There is only one path for the electric current to flow. If the circuit is broken, both lights will go out.

What type of circuit is this? Explain your choice.

### It is a conductor. The metal allows electrons to flow through the object.

Is this item a conductor or insulator? Explain your choice.

### This item is an insulator. The substance does not allow electrons to flow through the object.

Conductor or insulator? Explain your choice.

### A temporary magnet made up of a wire wrapped around a core

An electromagnet is -----------.

### B. Electiric Charge

What is a property of matter that causes objects to attract or repel each other?
a. compass
b. electric charge
c. electric circuit
d. electric field

### c. Negative charges move easily through them

What is a characteristic of most electric conductors?
a. They can be cut easily
b. Positive charges move easily through them
c. Negative charges move easily through them
d. they are soft and flexible

### D. It is made by wrapping current-carrying wire around an iron core.

Which statement is TRUE about an electromagnet?
a. It is a permanent magnet
b. increasing the number of coils decreases the strength
c. it cannot be turned off.
d. it is made by wrapping current-carrying wire around an iron core.

### C. It is a series circuit

If one burned-out bulb causes all of the lights in a circuit to fail, what might you conclude?
a. it is a parallel circuit
b. more batteries are needed.
c. it is a series circuit
d. a heavier wire is needed

### The compass needle will turn

If you place a compass next to an electromagnet what is likely to happen to the compass needle?

### The batteries are weak

A student added another light to an electrical circuit and all the lights became dimmer. What is most likely the cause of the dimmer lights?

### insulated wire, iron bar, and batteries

What supplies do you need for an electromagnet?
1. insulated wire
2. compass
3. iron bar
4. batteries
5. light bulb
6. magnet

### The lights would not come on because it is on a series circuit.

What would happen to this circuit if one of the light bulbs were removed?

### The bulb would continue to light up, because it is on a parallel circuit.

What would happen to the bulb on the left if the bulb in the middle of this diagram were removed?

### If an item that needs electricity is on a parallel circuit it will continue working if another item burns out. If an item on a series circuit goes out, no item on the circuit will work.

What is the advantage of a parallel circuit over a series circuit?

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