Show:
How Do Charges Behave?
What is Electric Current?
How is Electricity Used?
Vocabulary
Other
100
Two objects attract each other if they have opposite: a. static electricity b. electric charges c. electric circuits d. electric currents
b. electric charges
100
The circuits in a house are usually... a. series circuits. b. simple circuits. c. static electricity. d. parallel circuits.
d. parallel circuits.
100
What are three forms of energy that electrical energy can convert into?
Heat, light, motion, sound, or chemical energy
100
What is a watt? a. A device that opens and closes a circuit b. A device that changes electrical energy to light energy c. A material that an electric current passes through easily d. A unit used to measure electric power
d. A unit used to measure electric power
100
An electric cord is made up of a wire that is... a. a conductor. b. an insulator. c. a conductor, wrapped in a insulator. d. in a parallel circuit.
c. a conductor, wrapped in a insulator.
200
What is an electrically neutral object?
An object that has the same number of positive and negative charges.
200
What are the three parts of a working circuit?
A power source, conductor, and object using the current.
200
Explain why you shouldn't pull on a power cord to unplug an electrical device.
You may expose wires, which can causes sparks or a fire.
200
What is the difference between a conductor and an insulator?
Conductor - material that negatively charged particles flow through easily Insulator - material that charges DO NOT flow through easily
200
What is an example of a device that changes electrical energy into motion?
Power drill, wheel chair, hybrid car
300
Why would a charge repel or attract to another?
Repel - Like charges, two positive or negative objects Attract -Opposite charges, one positive and one negative
300
What is the difference between a series circuit and a parallel circuit?
Series circuit - electric current has only one path to follow Parallel circuit - more than one path to follow
300
How is electricity converted to heat and light?
Heat - electric currents flow through a conductor (the cord) to the heating unit. The heating unit has material that is material resistance to an electrical current, which causes the material to heat up. Light - electric currents flow through a conductor, the material inside of the object is resistant to an electrical current, which causes the material to heat up and glow brightly.
300
What is a battery?
A device that converts chemical energy into electrical energy.
300
How does a light switch work?
A switch controls whether a circuit is open or closed. When the switch is on, you close the circuit which turns on the light. When the switch is closed, you open the circuit when turns the light off.
400
You reach for a doorknob and receive a small shock. Use what you know about static electricity to explain why this happened.
Negative charges built up in your body and jumped from you body to the doorknob, which was not negatively charged.
400
Why shouldn't you overload an electric outlet (plug too many electronics into one outlet)?
It can cause too much current to flow through the outlet. The heat from the current can damage the insulation covering the wires, which can cause a fire inside the walls.
400
Why do you need a fan in a computer?
When electricity is used, heat is also produced. The fan keeps the computer from overheating.
400
What is the difference between an electric charge and an electric current?
Electric charges - units of electricity carried by tiny particles Electric current - continuous flow of electric charges
400
Why is current electricity more useful than static electricity?
Current electricity can be controlled
500
Suppose you pull a shirt from the dryer, and it has a sock stuck to it. Explain why that happens.
Clothes rub together in the dryer, causing charges to move and giving the clothes opposite charges, which attract.
500
A student tried to use pieces of plastic instead of wire to form a circuit with a bulb. Will the bulb light? Why or why not?
No, plastic is not a conductor; it is an insulator, so the current will not travel.
500
What would produce more heat: a typical light bulb, or a fluorescent light bulb?
Typical light bulb produces more heat because the electric current passes through a wire (which is a stronger conductor) to produce light. A fluorescent light bulb passes through a gas.
500
What is a built-up electric charge?
Static electricity
500
Suppose your home was wired entirely with series circuits. Describe some effects this might have on daily life in your home.
If one switch opened on the circuit, or on any other break in the circuit occurred, nothing on the circuit would work. Ex: If the living room circuit overloaded, no power would work in the entire house.