Chapter 17 Test Notes
What is an electric circuit?
A closed path along which currents can flow
Generator
A generator changes mechanical energy into electrical energy.
How does a generator work?
A generator has a permanent magnet and a coil of wire. A source of mechanical energy spins the coil of wire within the magnetic field, which produces the electric current.
What is an alternating circuit caused by?
A spinning coil
In a Series circuit what happens if a bulb burns out?
All of the other bulbs will go out
In a parallel circuit, what happens if a bulb goes out?
All of the other bulbs will stay lit
How does an electric motor work?
An electric motor has an electric magnet and a permanent magnet. When the motor is turned on, alternating electrical energy allows the electric magnet to rotate, because the electric magnet is continually repelled by the opposite pole of the permanent magnet.
Electric motor
An electric motor is a device that changes electrical energy to kinetic energy.
What are the parts of a simple circuit?
Battery, wire, switch, and an electrical device.
Stored energy in bonds of atoms is called:
Chemical energy
Copper is a very good and inexpensive :
Conductor
Radios and T.V.'s convert ______ _____ into ________ _______
Electrical energy into Mechanical energy
Kinetic energy is:
Energy in motion
Where does your body get chemical energy?
Food
Examples of chemical energy include:
Fossil fuels and food we eat
If you dribble a ball, where does the energy move?
From the ball to the air and floor
Friction is _______ from ________
Heat energy from moving parts
How is chemical energy transformed by your body?
Heat energy to maintain body temp. or Kinetic energy to move muscles
The Earth acts like a magnet because of the movement of ____ _______ _____ inside of the earth
Hot liquid metal
Kinetic and Potential energy are types of:
Mechanical energy
A generator turns ____ into _____:
Mechanical energy into electrical energy
Is a parallel or series circuit more useful in modern homes and why?
Parallel because if one thing stops working on a circuit, everything else keeps working.
Electromagnet induction is the process in which we use a changing magnetic field to:
Produce electricity
Potential energy is _________ based on ______.
Stored energy based on location
Magnets are stronger at:
The poles
The total Kinetic and Potential energy of particles is called:
Thermal energy
If you break a magnet in half, what happens to the magnetic domain?
You will have two magnets, the original domains will still point to the same pole, but the opposite ends of the new magnets will point to the other poles.
In order to strengthen an electromagnet, you can ___ _____, or ___ _________ _____
add coils, or add electrical power
