Electricity Part: 1
An object that is positively charged
____________.
has more protons than electrons
Because an air conditioner uses more electric power than a lightbulb in a given amount of time, what also must be true?
It must use more energy every second.
What can iron filings be used to show?
magnetic field
What does a transformer between utility wires and your house do?
decreases voltage
What is the device that is used to detect and measure small electric currents called?
galvanometer
What is the force between two electrons?
repulsive
What unit of electrical energy is sold by electric companies?
kilowatt-hour
Why does the needle of a compass point to magnetic north?
The compass needle aligns itself with Earth’s magnetic field.
Which energy transformation occurs in an electric motor?
electrical to kinetic
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
Why is severe electric shock dangerous?
All of the above is true.
What will the north poles of two bar magnets do when brought together?
repel
What prevents most charged particles from the Sun from hitting Earth?
Earth’s magnetic field
What is the name of 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 surrounds electric charges that cause them to affect each other though they are not touching?
An electric field
How many poles do all magnets have?
two
Which of these objects do magnetic fields NOT interact with?
paper
The circuit that gives, all devices receive the same voltage?
parallel circuit
What property does Earth have that causes grounding to drain static charges?
It is the conductor.
As more devices are added to a series circuit what happens to the current?
decreases
When a current-carrying wire is wrapped around an iron core, what can it create?
a magnet
Which energy transformation occurs in an electric generator?
electrical to kinetic
The circuit that makes all devices receive the same:
series circuit