Electric Charges and Electric Current
Name 2 Conductors and 2 Insulators.
Conductors: Gold and Copper
Insulators: Glass and Oil
more layers added_____?
greater current
Whats another name for a magnetic rock?
lodestone
What happens to the magnetic poles do over time?
they move around.
What is a electric circuit?
A unbroken flow of charge that goes in a continues loop.
What is a Ampere?
the amount of charge that passes through a wire per unit time.
what is a electrochemical cell?
a device that transforms chemical energy into electrical energy.
Whats a compass?
a device that has a magnetized needle that spins freely.
What is a solenoid?
a coil of wire with a current
Solve.
A walkman uses a standard 1.5V battery. How much resistance is in the circuit if it uses a current of 0.01A?
150 ohms.
What is Static Electricity?
The build up of charges on an object. ( static means not moving)
what is a wet cell and a dry cell?
Wet cell: an electrochemical cell where the elecrolyte is a liquid
Dry cell: an electrochemical cell where the elecrolyte is a paste
If lines are close together______?
the field is stronger
Who is Hans Christan Oersted?
Danish Scientist who put a compass near a circuit and the compass needle changed direction.
What law gives a relationship between resistance, current, and voltage?
ohms law.
What are two ways electric charges interact?
1. The area around a charged object
2. Attraction is a pull
What is a Short Circuit?
a connection that allows current to take the path of least resistance
How many names are for the North star? and what are they?
2 names.
Lodestar and Polaris
What are 3 electromagnets?(i couldn't find what it went to it)
1. doorbells
2. cranes
3. autotapes
What 2 things did Volta use in his hypothesis?
2. zinc
Name four factors that determine Resistance.
1. material
2. length of wire
3. diameter of wire
4. temperature of wire
Name 2 definitions that help you from getting struck by lightning. Then what do they mean.
1. Grounded: earth plays an important role in electrical safety
2. Third prong:a round prong that connect any metal pieces of the appliance to the ground wire of a building
What is called the Northern lights?
And what is called the Southern lights?
1. Borealis
2. Australis
Who is Sir William Gilbert and what did he do?
Gilbert confirmed that a compass always points in the same direction, no matter where it is. Gilbert hypothesized that a compass behaves a it does because earth acts as a giant magnet. He was a Science Mayger.
What happend in Galvani's Laboratory?
In his lab he touched a wire to a animal and the animal twitched.