Electricity Pt. 1
What is the best conductor of electricity
Copper
A device used to detect and measure small electric currents
galvanometer
An object that is positively charged ____.
has more protons than electrons
Why does the needle of a compass point to magnetic north?
The compass needle aligns itself with Earth's magnetic field
An electromagnetic creates a magnetic force:
as long as a power source is connected
A direct current (dc) battery converts:
chemical energy into electrical energy
A single path for current
Series Circuit
What is the force between two electrons?
repulsive
What does a transformer between utility wires and your house do?
decreases voltage
What would not be attracted to a magnet?
copper
A material that is a good electrical insulator is
most likely a metal
An electrical device that changes the voltage of alternating current is called a(n) :
Transformer
How much power does the average hair dryer use?
1,200 W
Which energy transformation occurs in a electric generator?
electrical to kinetic
Like charges ___; unlike charges ___.
repel; attract
The flow of charged particles is called:
an electric current
An electrical device that turns off a circuit when the circuit becomes overloaded
Circuit Breaker
What property of a wire increases when it is made thinner?
resistance
What can iron filings be used to show?
magnetic field
What prevents most charged particles from the Sun from hitting the Earth?
Earth's magnetic field
A light bulb transforms electrical energy into:
heat and light
A measure of the energy for an amount of charge
Voltage
It is a conductor
How many poles do all magnets have?
two
What does a transformer between utility wires and your house do?
decreases voltage